Matthew 26:40
And he came to the disciples and found them sleeping. And he said to Peter: so, could you not watch with me one hour? The disciples who were asked to watch are sleeping. The question to Peter — who a few minutes earlier claimed he would die with Jesus — is the gentle rebuke of disappointed expectation: could you not watch one hour? The one hour is both the specific time of prayer and the image of the sustained watchfulness that the Olivet Discourse had called for.