Matthew
Matthew 22:19BSB·traditional attribution

Show Me the coin used for the tax.” And they brought Him a denarius.

John Calvin Reformed @genevareformer

19. Show me the tribute-money. When Christ orders them to bring forward a coin, though at first sight it appears to be of no great importance, yet it is sufficient for breaking their snares. In this way they had already made an acknowledgment of subjection, so that Christ did not find it necessary to enjoin upon them any thing new.

John Gill Reformed Baptist @doctorgill

They say unto him, Caesar's,.... Either Augustus Caesar's; for there was a coin of that emperor's, as Dr. Hammond reports, from Occo, which had his image or picture on it, and in it these words written, Augustus Caesar, such a year, "after the taking of Judaea"; which if this was the coin, was a standing testimony of the subjection of the Jews to the Romans...

Albert Barnes Presbyterian @notesbybarnes

Verse 19. The tribute money. The money in which the tribute was paid. This was a Roman coin. The tribute for the temple-service was paid in the Jewish shekel; that for the Roman government in foreign coin. Their having that coin about them, and using it, was proof that they themselves held it lawful to pay the tribute; and their pretensions, therefore, were mere hypocrisy. A penny.