Augustine of Hippo

(De Cons. Ev. ii. 47.) This may seem contrary to that Matthew says, that having sent the multitudes away, He went up into a mountain that He might pray alone; and John again says, that it was on a mountain that He fed this same multitude. But since John himself says further, that after that miracle He retired to a mountain that He might not be held by the multitude, who sought to make Him a king, it is clear that He had come down from the mountain when He fed them. Nor do Matthew’s words, He went up into a mountain alone to pray, disagree with this, though John says, When he knew that they would come to make him a king, he withdrew into a mountain himself alone. (John 6:15.) For the cause of His praying is not contrary to the cause of His retiring, for herein the Lord teaches us that we have great cause for prayer when we have cause for flight. Nor, again, is it contrary to this that Matthew says first, that He bade His disciples go into the boat, and then that He sent the multitudes away, and went into a mountain alone to pray; while John relates that He first withdrew to the mountain, and then, when it was late, his disciples went down to the sea, and when they had entered into a boat, &c. for who does not see that John is relating as afterwards done by His disciples what Jesus had commanded before He retired into the mountain?