Mark 6:39

(Con. Evan. 2. 46) It goes on, And he commanded them to wake all sit down by companies upon the green grass, and they sat down in ranks by hundreds and by fifties. But we need not be perplexed, though Luke says that they were ordered to sit down by fifties, and Mark by hundreds and fifties, for one has mentioned a part, the other the whole. Mark, who mentions the hundreds, fills up what the other has left out.

(ubi sup.) Again, those men lie down on grass and are fed by the food of the Lord, who have trodden under foot their concupiscences by continence, and apply themselves diligently to hear and fulfil the words of God. The Saviour, however, does not create a new sort of food; for when He came in the flesh He preached no other things than were predicted, but showed how pregnant with mysteries of grace were the writings of the Law and the Prophets. He looks up to heaven, that He may teach us that there we must look for grace. He breaks and distributes to the disciples that they may place the bread before the multitudes, because He has opened the mysteries of prophecy to holy doctors, who are to preach them to the whole world. What is left by the crowd is taken up by the disciples, because the more sacred mysteries, which cannot be received by the foolish, are not to be passed by with negligence, but to be inquired into by the perfect. For by the twelve baskets, the Apostles and the following Doctors are typified, externally indeed despised by men, but inwardly full of healthful food. For all know that carrying baskets is a part of the work of slaves.

We are given to understand that they lay down in parties, separate from one another, for what is translated by companies, is repeated twice over in the Greek, as though it were by companies and companies.