Greetings!
I know that this is a (very) old topic/thread, but my wife and I were reading through the book of Numbers this week. The words of Jesus in this passage from Revelation 2:14, 20 mentioned by the original post are a direct reference to Numbers chapters 21-24.
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Revelation 2:14 (ESV)
"But I have a few things against you: you have some there who hold the teaching of Balaam, who taught Balak to put a stumbling block before the sons of Israel, so that they might eat food sacrificed to idols and practice sexual immorality."
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If you read Numbers 22-24, it's almost a bit puzzling. Balaam doesn't come across as a particularly bad person. He did speak to YHWH and YHWH spoke to him. He even prophesied about the Messiah being born (Numbers 25:17).
King Balak of Moab wanted to hire Balaam to curse Israel. Balaam only went with Balak's men after consulting God about it. God even opened the mouth of Balaam's donkey when he was in danger and even opened Balaam's eyes to see that danger (i.e., angel of the LORD with sword in hand).
Balak was afraid of Israel and hoped that a curse upon Israel by Balaam would stop them. Yet, Balaam never cursed Israel. In fact, he actually spoke the words that God gave him -- which BLESSED Israel.
Eventually, Balak and Balaam parted company with Balaam never having cursed Israel. So, why is Balaam mentioned so often in the Bible as an example of so much bad? After all, Balaam is referenced in this aspect in Numbers (chapters 22-24, 31), Deuteronomy (chapter 23), Joshua (chapters 13 and 24), Nehemiah (chapter 13), Micah (chapter 6), 2 Peter (chapter 2), Jude and Revelation!
The outcome of Balaam's interaction with Balak is found in Numbers chapter 25 with the subsequent events after Balaam left Balak.
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Numbers 25:1-3 (ESV)
1 While Israel lived in Shittim, the people began to whore with the daughters of Moab.
2 These invited the people to the sacrifices of their gods, and the people ate and bowed down to their gods.
3 So Israel yoked himself to Baal of Peor. And the anger of the Lord was kindled against Israel.
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Essentially, Balaam (that "profit for hire") taught Balak by what he didn't say. Balaam had revealed to King Balak that God would not curse or destroy Israel. In fact, in Numbers 25:9, Balaam uttered that God would bless those who bless Israel and curse those who cursed Israel. So, this revealed something to Balak: The only way for Israel to be destroyed was from within.
And this is exactly what began to happen!
Women from Moab went down and enticed the men of Israel; and, the men of Israel began engaging in sexual immorality. Moreover, these women enticed the men of Israel to attend the sacrifices that they offered to their gods.
If you remember how the sacrifices of Israel were conducted, it wasn't simply people dropping off livestock to be burned. There was a set of Levitical rules that the priests followed. Part of the sacrifice was to be eaten by the priests (Leviticus 6 and 7). Foreigners also sacrificed to their gods. However, their sacrifices were handled differently. Pagans would strangle the blood from the animals and then eat the meat sacrificed to their gods.
So, essentially, these Moabite and Midianite women not only engaged in immorality with Israeli men, but they enticed them to attend the sacrifices, watch the blood and eat that meat. By doing this, Israel had hastened its own destruction from the inside. Balaam couldn't curse Israel. However, by engaging in this, the people of Israel could curse themselves.
In fact, a plague broke out against Israel. It was only abated after Phinehas, the grandson of Aaron, killed an Israelite and a Midianite woman in their tent.
So, when I read New Testament passages referring to food sacrificed to idols, this is what I believe it is referring to. It is the enticement to partake in the table of God and the table of demons (I Corinthians 10:21).
It is also what I believe the apostles were referring to in the first council in Jerusalem (Acts 15:1-29). At that time, a question arose as to whether or not gentiles who were turning to God needed to be circumcised. Paul and Barnabas traveled to Jerusalem for an answer.
The apostles rejoiced that many gentiles were being saved. However, they pointed out that the gentiles were having their hearts cleansed -- not by adherence to the Law of Moses -- but by faith (Acts 15:9). After all, Paul later pointed out that this is how God established the covenant with Abraham -- that he "believed God" and it was credited to him as righteousness (hundreds of years before the Covenant Law of Moses).
So, the apostles said that they shouldn't make it difficult for the gentiles who were being saved. Yet, they still felt impressed to warn them to avoid these things: Things sacrificed to idols, the products of strangling and blood and sexual immorality (verses 19-20; 28-29). With this in mind, it is likely that the "products of strangling" and "blood" are a direct reference to what is "sacrificed to idols."
This seems like a direct reference to the error of Balaam -- and how Balak learned that God's chosen people cannot be cursed by God but can bring about a curse upon themselves. This occurred at Peor when the Israelites engaged in sexual immorality with foreign women and partook in their sacrifices (including eating some of the sacrifice).
Don't forget: This was not just the sins of the Israelites in the wilderness. This was also the sin of Solomon.
In I Kings chapter 11, we read about how Solomon -- this man of wisdom and discernment -- tried to partake in both the table of God and demons. Like some of the Israelites in the wilderness, Solomon's heart was smitten by foreign women.
1 Now King Solomon loved many foreign women, along with the daughter of Pharaoh: Moabite, Ammonite, Edomite, Sidonian, and Hittite women, 2 from the nations concerning which the Lord had said to the people of Israel, "You shall not enter into marriage with them, neither shall they with you, for surely they will turn away your heart after their gods.” Solomon clung to these in love. 3 He had 700 wives, who were princesses, and 300 concubines. And his wives turned away his heart. 4 For when Solomon was old his wives turned away his heart after other gods, and his heart was not wholly true to the Lord his God, as was the heart of David his father. 5 For Solomon went after Ashtoreth the goddess of the Sidonians, and after Milcom the abomination of the Ammonites. 6 So Solomon did what was evil in the sight of the Lord and did not wholly follow the Lord, as David his father had done. 7 Then Solomon built a high place for Chemosh the abomination of Moab, and for Molech the abomination of the Ammonites, on the mountain east of Jerusalem. 8 And so he did for all his foreign wives, who made offerings and sacrificed to their gods.I Kings 11:1-8 (ESV)
While it doesn't say that Solomon ate from the food sacrificed to those gods, it does say that he built their high places! This is Solomon -- the son of David to whom God appeared TWICE. Yet, he no longer wholly followed God. He now had something within him that competed with his love for God.
In fact, the whole of the subsequent history of Israel and Judah was a result of the consequences of Solomon's sin. Israel was torn from his son and divided into two. The first thing that King Jeroboam and Israel did after the division? They built TWO golden calves and sacrificed to them! In fact, Jeroboam told the people of Israel that they had gone to Jerusalem long enough -- and that they could sacrifice to these calves who "brought them out of Egypt" (I Kings 12:29-29).
Essentially, the captivity eventually came about because of Solomon's sin. Solomon's sin was essentially the same as the Israelites in Numbers 25 -- when the men of Israel engaged in sexual immorality and ate food sacrificed to idols.
Nowadays, we don't have many groups offering sacrifices to their idols/gods. We don't see many groups who are slaughtering animals, strangling them, pouring out the blood (and using it) and then eating what it left after it is roasted. However, there are some who still do this...and I think that it is prudent to avoid partaking in it.
However, sexual immorality is arguably more rampant today than it was back then! Through hedonism, atheism and antagonistic mockery of God, people have set themselves up as their own "god" -- their own "idol." They live their lives without the very thought of our Creator and what is coming. The covenant that God has made? They scoff at it.
Our faith in Christ is the most important thing in this universe. After all, we "must believe that he is and that he is a rewarder of those who diligently seek him" (Hebrews 11:1-6).
So, as Revelation 2:14 puts it, the error of Balaam is about the stumbling blocks of our faith that we partake in. After all, anything that we put before God is an idol. Anything that competes with our devotion to God is an idol.
For the Israelites in the wilderness, this was sexual immorality and food sacrificed to idols. Solomon also fell over this same stumbling block -- and the course of Israeli history was forever changed. This eventually resulted in those who were freed from captivity in Egypt now being carried off into captivity in Assyria, Babylon and Persia.
So, essentially, I would say that the stumbling of sexual immorality is still very much a part of this world. However, the most common modern idols have changed just a bit. It's about partaking in this world and its race to forget or forsake God. It reminds me of how Christian and Faithful refused to partake in the goods sold at "Vanity Fair" in John Bunyan's allegory PILGRIM'S PROGRESS. It also reminds me how Keith Green stopped playing music after he came to Christ until it was no longer his idol.
All of this also reminds me of a song I recently heard:
https://www.youtube.com/watch?v=4VkHd7froJo