Mark 13:35
Therefore keep watch, because you do not know when the owner of the house will come back — whether in the evening, or at midnight, or when the rooster crows, or at dawn — the four watches of the night (evening, midnight, rooster-crow, dawn) are the four-part Roman division of the night watch. Each watch is named to communicate that the return could come at any time within the period of waiting. The four watches of the night correspond exactly to the four scenes of Jesus' passion night (evening — Last Supper, midnight — Gethsemane, rooster-crow — Peter's denial, dawn — the morning trial).