Augustine of Hippo
Catena Aurea · Lukasevangelium 9
And the apostles, when they were returned, told him all that they had done. And he took them, and went aside privately into a desert place belonging to the city called Bethsaida. And the people, when they knew it, followed him: and he received them, and spake unto them of the kingdom of God, and healed them that had need of healing. And when the day began to wear away, then came the twelve, and said unto him, Send the multitude away, that they may go into the towns and country round about, and lodge, and get victuals: for we are here in a desert place. But he said unto them, Give ye them to eat. And they said, We have no more but five loaves and two fishes; except we should go and buy meat for all this people. For they were about five thousand men. And he said to his disciples, Make them sit down by fifties in a company. And they did so, and made them all sit down. Then he took the five loaves and the two fishes, and looking up to heaven, he blessed them, and brake, and gave to the disciples to set before the multitude. And they did eat, and were all filled: and there was taken up of fragments that remained to them twelve baskets.
(ubi sup.) That Luke says here, that the men were ordered to sit down by fifties, but Mark, by fifties and hundreds, does not matter, seeing that one spoke of a part, the other of the whole. But if one had mentioned only the fifties, and the other only the hundreds, they would seem to be greatly opposed to one another; nor would it be sufficiently distinct which of the two was said. But who will not admit, that one was mentioned by one Evangelist, the other by another, and that if more attentively considered it must be found so. But I have said thus much, because often certain things of this kind exist, which to those who take little heed and judge hastily appear contrary to one another, and yet are not so.