Matthew 26:30
And when they had sung a hymn, they went out to the Mount of Olives. The Passover hymn — the Hallel (Psalms 113–118) traditionally sung at the conclusion of the Passover meal — and the departure to the Mount of Olives. The Psalm 118 Hosanna that opened the passion week now closes the Last Supper. The departure to the Mount of Olives is the departure toward Gethsemane and the arrest.