NET
21 You cannot drink the cup of the Lord and the cup of demons. You cannot take part in the table of the Lord and the table of demons.
Darby
21 Ye cannot drink [the] Lord's cup, and [the] cup of demons: ye cannot partake of [the] Lord's table, and of [the] table of demons.
KJV
21 Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord's table, and of the table of devils.