What is the cup of demons in 1 Corinthians 10:21?

In 1 Corinthians 10, the apostle Paul urges Christians to be on guard against sin and to avoid Israel’s error of idolatry. He warns the Corinthians that they cannot participate in the Lord’s Supper (Communion) and in pagan temple feasts, because both meals constitute spiritual fellowship. Paul writes, “Flee from the worship of idols… you cannot drink from the cup of the Lord and from the cup of demons, too. You cannot eat at the Lord’s Table and at the table of demons, too” (1 Corinthians 10:14, 21, NLT).

The “cup of demons” refers to drinking rituals at pagan banquets, where wine was dedicated to a deity. Corinth was a worldly city, home to temples dedicated to gods such as Aphrodite and Apollo. Social events, business gatherings, and family celebrations often took place in these temples. At these occasions, people ate meat offered to idols and drank wine poured out in honor of the gods.

For many new Christians in Corinth, these meals were part of their old life, and they were tempted to continue attending them. Thus, Paul writes to inform the Corinthians that these were not harmless affairs but acts of worship, even if they did not intend them to be. Christians cannot mix worship of Christ with participation in pagan rituals.

To illustrate his point, Paul explains in 1 Corinthians 10:16–17 that drinking from the Lord’s “cup of blessing” in Christian Communion is a spiritual participation (koinonia in Greek) in Christ’s blood (1 Corinthians 10:16, ESV). When believers drink from this cup, they share in Christ’s sacrifice and declare their loyalty to Him. When they break and eat the bread of Communion, they, in a spiritual sense, have fellowship with Christ’s body. They enter covenant fellowship with the Lord.

In 1 Corinthians 10:18, Paul points to the Old Testament altar and temple sacrifices to further emphasize his point. God’s people cannot participate in fellowship with the Lord—symbolized by the Old Testament sacrifices and the New Testament bread and wine—and share at the demon’s table, which involves food and drink offered to idols, without risking temptation, exposure to danger, and offending the Lord.

Paul is not saying idols have real power over believers. In 1 Corinthians 8:4, he has already said that idols are “nothing” compared to the one true God. But he is saying that behind idol worship are real spiritual forces that oppose God. When believers join idol feasts, they open themselves to fellowship with those forces.

Paul’s warning centers on exclusive loyalty and the purity of worship (Exodus 20:3–5; Deuteronomy 6:13–15; Matthew 4:10; Hebrews 12:28–29). In the Old Testament, God often described His relationship with His people as a marriage covenant (Jeremiah 31:31–32; Ezekiel 16:8–14; Hosea 2:19–20). Worshiping other gods was viewed as spiritual adultery (Jeremiah 3:6–10; Hosea 4:12–13). Paul has this idea in mind when he asks in 1 Corinthians 10:22, “Are we trying to arouse the Lord’s jealousy?” Just as a spouse expects faithfulness, God expects His people to be loyal to Him alone.

Fellowship in the Lord’s Supper is a sign of that loyalty. When Christians gather to break bread and drink the cup, they declare that Jesus is their Lord. They remember His death and celebrate their union with Him and with one another. Taking part in pagan temple meals and drinking the cup of demons at the same time sends a mixed message. It is like trying to belong to two families at once. Paul says this is impossible. You cannot drink from both cups because they represent two opposing kingdoms.

James warns readers about having mixed loyalties: “If you want to be a friend of the world, you make yourself an enemy of God” (James 4:4, NLT). He urges, “Come close to God, and God will come close to you. Wash your hands, you sinners; purify your hearts, for your loyalty is divided between God and the world” (James 4:8, NLT). Paul cautions believers not to be “yoked together with unbelievers,” but to come out and be separate from the world, and to “purify [yourselves] from everything that contaminates body and spirit” (2 Corinthians 6:14–7:1; see also Psalm 106:36–38).

Today, most people do not attend pagan temple feasts, yet Paul’s warning remains relevant. Anything that pulls our loyalty away from Christ can become a form of idolatry. The “cup of demons” reminds us that our worship must be wholehearted. We cannot mix devotion to Christ with devotion to anything that competes with Him.