John 6:63-64

63 aIt is the Spirit who gives life; bthe flesh is no help at all. cThe words that I have spoken to you are spirit and life. 64But dthere are some of you who do not believe.” (For Jesus eknew from the beginning who those were who did not believe, and fwho it was who would betray him.)

1 Corinthians 10:21

21 gYou cannot drink the cup of the Lord and hthe cup of demons. You cannot partake of the table of the Lord and ithe table of demons.
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