when
Mark 14:22
And as they did eat, Jesus took bread, and blessed, and brake it, and gave 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 the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth 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;