Hilary of Poitiers
Catena Aurea · Matthäusevangelium 26
Then cometh Jesus with them unto a place called Gethsemane, and saith unto the disciples, Sit ye here, while I go and pray yonder. And he took with him Peter and the two sons of Zebedee, and began to be sorrowful and very heavy. Then saith he unto them, My soul is exceeding sorrowful, even unto death: tarry ye here, and watch with me.
(in loc.) Since then we read that the Lord was sorrowful, let us discover the causes of His agony. He had forewarned them all that they would be offended, and Peter that he would thrice deny his Lord; and taking him and James and John, He began to be sorrowful. Therefore He was not sorrowful till He took them, but all His fear began after He had taken them; so that His agony was not for Himself, but for them whom He had taken.