1 Corinthians 10:21

Cannot. The inability imposed upon believers by their knowledge of the real nature of idolatry is not physical but moral. How could those who are dedicated to the true God partake of drink offerings to Satan and his host?

Cup of the Lord. This is a reference to the wine of the communion service (see Matt. 26:27, 28). This cup belongs to the Lord, it has been consecrated to Him, and is the communion of His blood; therefore it brings those partaking of it into fellowship with Him.

Cup of devils. A symbol of all the feasting in honor of heathen gods. Satan and his followers are ever seeking to oppose and overthrow the good and wise government of God and establish the rule of sin and rebellion. Between these two ways of life there can be no communion or association. There can be no compromise between God and Satan, truth and error, righteousness and sin. Every man is called upon to choose whom he will serve. It is impossible to hold fellowship with God and with Satan at the same time; one or the other must be renounced (see Gen. 35:2-4; Joshua 24:14-16; 1 Kings 18:21; Matt. 6:24).