13 And the pasch of the Jews was at hand, and Jesus went up to Jerusalem.
Alcuin: The Gospels mention two journeys of our Lord to Jerusalem, one in the first year of His preaching, before John was sent to prison, which is the journey now spoken of; the other in the year of His Passion. Our Lord has set us here an example of careful obedience to the Divine commands. For if the Son of God fulfilled the injunctions of His own law, by keeping the festivals, like the rest, with what holy zeal should we servants prepare for and celebrate them?
14 And he found in the temple them that sold oxen and sheep and doves, and the changers of money sitting.
Bede: Our Lord on coming to Jerusalem, immediately entered the temple to pray; giving us an example that, wheresoever we go, our first visit should be to the house of God to pray.
Those however, who came from a distance, being unable to bring with them the animals required for sacrifice, brought the money instead. For their convenience the Scribes and Pharisees ordered animals to be sold in the temple.
15 And when he had made, as it were, a scourge of little cords, he drove them all out of the temple, the sheep also and the oxen, and the money of the changers he poured out, and the tables he overthrew.
Bede: The Evangelist sets before us both natures of Christ: the human in that His mother accompanied Him to Capernaum; the divine, in that He said, Make not My Father’s house an house of merchandize.
Augustine: Every one by his sins twists for himself a cord, in that he goes on adding sin to sin. So then when men suffer for their iniquities, let them be sure that it is the Lord making a scourge of small cords, and admonishing them to change their lives.
Scripture from the Douay-Rheims Bible. Commentary from St. Thomas Aquinas, Catena Aurea, Vol. IV (London: Rivington, 1845).