John Lightfoot on Matthew 21:12

[He cast out all them that sold and bought in the Temple.] I. There was always a constant market in the Temple in that place which was called the shops; where every day was sold wine, salt, oil, and other requisites to sacrifices; as also oxen and sheep, in the spacious Court of the Gentiles.

II. The nearness of the Passover had made the market greater; for innumerable beasts being requisite to this solemnity, they were brought hither to be sold. This brings to mind a story of Bava Ben Buta: "He coming one day into the court found it quite empty of beasts. 'Let their houses,' said he, 'be laid waste, who have laid waste the house of our God.' He sent for three thousand of the sheep of Kedar; and having examined whether they were without spot, brought them into the Mountain of the House"; that is, into the Court of the Gentiles.

[Overthrew the tables of the moneychangers.] Who those moneychangers were, may be learned very well from the Talmud, and Maimonides in the treatise Shekalim:--

"It is an affirmative precept of the law, that every Israelite should give half a shekel yearly: even the poor, who live by alms, are obliged to this; and must either beg the money of others, or sell their clothes to pay half a shekel; as it is said, 'The rich shall give no more, and the poor shall give no less.'"

"In the first day of the month Adar, they made a public proclamation concerning these shekels, that every one should provide his half shekel, and be ready to pay it. Therefore, on the fifteenth day of the same month, the exchangers sat in every city, civilly requiring this money: they received it of those that gave it, and compelled those that did not. On the five-and-twentieth day of the same month they sat in the Temple; and then compelled them to give; and from him that did not give they forced a pledge, even his very coat."

"They sat in the cities, with two chests before them; in one of which they laid up the money of the present year, and in the other the money of the year past. They sat in the Temple with thirteen chests before them; the first was for the money of the present year; the second, for the year past; the third, for the money that was offered to buy pigeons," &c. They called these chests trumpets, because, like trumpets, they had a narrow mouth, and a wide belly.

"It is necessary that every one should have half a shekel to pay for himself. Therefore, when he comes to the exchanger to change a shekel for two half shekels, he is obliged to allow him some gain, which is called kolbon. And when two pay one shekel [between them], each of them is obliged to allow the same gain or fee."

And not much after, "How much is that gain? At that time when they paid pence for the half shekel, a kolbon [or the fee that was paid to the moneychanger] was half a mea, that is, the twelfth part of a penny, and never less. But the kolbons were not like the half shekel; but the exchangers laid them by themselves till the holy treasury were paid out of them." You see what these moneychangers were, and whence they had their name. You see that Christ did not overturn the chests in which the holy money was laid up, but the tables on which they trafficked for this unholy gain.

[Of those that sold doves] Sellers of doves. See the Talmudic treatise of that title. "Doves were at one time sold at Jerusalem for pence of gold. Whereupon Rabban Simeon Ben Gamaliel said, By this temple I will not lie down this night, unless they be sold for pence of silver, &c. Going into the council-house, he thus decreed, A woman of five undoubted labours, or of five undoubted fluxes, shall be bound only to make one offering; whereby doves were sold that very day for two farthings." The offering for women after childbirth, and fluxes, for their purification, were pigeons, &c. But now, when they went up to Jerusalem with their offerings at the feasts only, there was at that time a greater number of beasts, pigeons, and turtles, &c. requisite. See what we have said at the fifth chapter, and the three-and-twentieth verse.