when.

Mark 14:22
While they were eating, Jesus took bread, spoke a blessing and broke it, and gave it to them, saying, "Take it; this is My body."

Luke 22:17
After taking the cup, He gave thanks and said, "Take this and divide it among yourselves.

Romans 14:6
He who observes a special day does so to the Lord; he who eats does so to the Lord, for he gives thanks to God; and he who abstains does so to the Lord and gives thanks to God.

1 Corinthians 10:16
Is not the cup of blessing that we bless a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ?

and they.

Matthew 26:27
Then He took the cup, gave thanks and gave it to them, saying, "Drink from it, all of you.