George Leo Haydock

Satan entered into him, who presently went out with great anger and indignation. It was then night, likely about nine o’clock. (Witham) — That which thou dost, do quickly. It is not a license, much less a command, to go about his treason: but a signification to him, that Christ would not hinder or resist what he was about, do it as soon as he pleased: but was both ready, and desirous to suffer for our redemption. (Challoner) — Christ does not by these words exhort the traitor, much less command him, to perform his wicked deed; but he means to reprobate it, and at the same time testify that he would not hinder his being betrayed. (St. Chrysostom, hom. lxxi. in Joan.) — It is the voice not of command, but of permission, not of a person in fear, but of one prepared for death. (St. Leo)