Jesus knew that the Father had delivered all things into His hands, and that He had come from God and was returning to God.
It has generally been taken for granted by commentators that Christ's washing his disciples' feet, and the discourse that followed it, were the same night in which he was betrayed, and at the same sitting wherein he ate the passover and instituted the Lord's supper; but whether before the solemnity began, or after it was all over, or between the eating of the passover and...
Commenting on John 13:1-17
Jesus knowing that the Father had given all things into his hands, and that he was come from God, and went to God; (b) Into his power.
Verse 3. Jesus knowing, &c. With the full understanding of his dignity and elevation of character, he yet condescended to wash their feet. The evangelist introduces his washing their feet by saying that he was fully conscious of his elevation above them, as being intrusted with all things, and this made his humiliation the more striking and remarkable.