when
Mark 14:22
And as they ate, Jesus took bread, and blessed and broke it, and gave it to them and said, "Take, eat; this is My body."
Luke 22:17
And He took the cup, and gave thanks and said, "Take this, and divide it among yourselves;
Romans 14:6
He that regardeth one day, regardeth it unto the Lord; and he that regardeth not that day, to the Lord doth he not regard it. He that eateth, eateth to the Lord, for he giveth God thanks; and he that eateth not, to the Lord he eateth not and giveth God thanks.
1 Corinthians 10:16
The cup of blessing which we bless: is it not the communion of the blood of Christ? The bread which we break: is it not the communion of the body of Christ?
and they
Matthew 26:27
And He took the cup and gave thanks, and gave it to them, saying, "Drink ye all of it;