The Gospel According to Mark 13:31-37: 14:1-2
The Lord said to his disciples, "Heaven and earth will pass away, but my words will not pass away. But of that day or that hour no one knows, not even the angels in heaven, nor the Son, but only the Father. Take heed, watch; for you do not know when the time will come. It is like a man going on a journey, when he leaves home and puts his servants in charge, each with his work, and commands the doorkeeper to be on the watch. Watch therefore -- for you do not know when the master of the house will come, in the evening, or at midnight, or at cockcrow, or in the morning -- lest he come suddenly and find you asleep. And what I say to you I say to all: Watch." It was now two days before the Passover and the feast of Unleavened Bread. And the chief priests and the scribes were seeking how to arrest him by stealth, and kill him; for they said, "Not during the feast, lest there be a tumult of the people."