And as he taught them, he said, “Is it not written: ‘My house will be called a house of prayer for all nations’? But you have made it ‘a den of robbers.’”
A T Robertson
For all the nations (pāsin tois ethnesin). Mark alone has this phrase from Isa 56:7, Jer 7:11. The people as well as the temple authorities were guilty of graft, extortion and desecration of the house of prayer. Jesus assumes and exercises Messianic authority and dares to smite this political and financial abuse. Some people deny the right of the preacher to denounce such abuses in business and politics even when they invade the realm of morals and religion. But Jesus did not hesitate.
John Gill
My houe, etc For not only the Jews went up to the temple to pray, see Lk 8:10, but the Gentiles also, who became of the Jewish religion, and had a court built for that purpose; and so the whole temple, from hence, was called an house of prayer: and the meaning is, not only that it should be called so by the Gentiles, but that it should be so to them, and made use of by them as such. Jarchi's note on the clause in Isa 56:7 is "not for Israel only, but also for the proselytes."
Den of robbers, etc for no other, in our Lord's esteem, were the buyers and sellers of sheep, oxen, and doves, and the money changers, and the priests that encouraged them, and had a profit out of them: now these had their seats, shops, and tables, within the mountain of the house; and even in that part of it, which was assigned to the Gentiles, the nations of the world, who became proselytes, and came up to Jerusalem to worship there at certain times; See Mt 21:13.
Matthew Henry
He gave a good reason for this; because it was written, My house shall be called of all nations, The house of prayer, (17). So it is written, Isa 56:7. It shall pass among all people under that character. It shall be the house of prayer to all nations; it was so in the first institution of it; when Solomon dedicated it, it was with an eye to the sons of the strangers, 1Ki 8:41. And it was prophesied that it should be yet more so. Christ will have the temple, as a type of the gospel-church, to be,
(1) A house of prayer. After he had turned out the oxen and doves, which were things for sacrifice, he revived the appointment of it as a house of prayer, to teach us that when all sacrifices and offerings should be abolished, the spiritual sacrifices of prayer and praise should continue and remain for ever. (2) That it should be so to all nations, and not to the people of the Jews only; for whosoever shall call upon the name of the Lord, shall be saved, though not of the seed of Jacob, according to the flesh. It was therefore insufferable for them to make it a den of thieves, which would prejudice those nations against it, whom they should have invited to it. When Christ drove out the buyers and sellers at the beginning of his ministry, he only charged them with making the temple a house of merchandise (Jn 2:16); but now he chargeth them with making it a den of thieves, because since then they had twice gone about to stone him in the temple (Jn 8:59; 10:31), or because the traders there were grown notorious for cheating their customers, and imposing upon the ignorance and necessity of the country people, which is no better than downright thievery. Those that suffer vain worldly thoughts to lodge within them when they are at their devotions, turn the house of prayer into a house of merchandise; but they that make long prayers for pretence to devour widows' houses, turn it into a den of thieves.