Ambrose of Milan
Catena Aurea · Lukasevangelium 19
And when he had thus spoken, he went before, ascending up to Jerusalem. And it came to pass, when he was come nigh to Bethphage and Bethany, at the mount called the mount of Olives, he sent two of his disciples, Saying, Go ye into the village over against you; in the which at your entering ye shall find a colt tied, whereon yet never man sat: loose him, and bring him hither. And if any man ask you, Why do ye loose him? thus shall ye say unto him, Because the Lord hath need of him. And they that were sent went their way, and found even as he had said unto them. And as they were loosing the colt, the owners thereof said unto them, Why loose ye the colt? And they said, The Lord hath need of him. And they brought him to Jesus: and they cast their garments upon the colt, and they set Jesus thereon. And as he went, they spread their clothes in the way.
Nor is it for nothing that two disciples are directed thither; Peter to Cornelius, Paul to the rest. And therefore He did not mark out the persons, but determined the number. Still should any one require the persons, he may believe it to be spoken of Philip, whom the Holy Spirit sent to Gaza, when he baptized the eunuch of Queen Candace. (Acts 8:38.)