John Gill Commentary Matthew 22:19

"Show me the tribute money. And they brought unto him a denarius." — Matthew 22:19 (ASV)

Show me the tribute money
Not any money, or any sort of coin that was current among them; but that in which the tribute was usually paid, which was Roman money: and they brought to him a penny; not as, being what was the usual sum that was paid for tribute at one time, but as a sample of what sort of money it was paid in, in Roman pence; one of which was seven pence halfpenny of our money.