The Jewish leaders, led by the high priest, paid Judas thirty silver coins to betray Jesus by handing him over to them. This happened just as the prophets said it would. Judas agreed, took the money, and went away. He began looking for an opportunity to help them arrest Jesus.

This is background information about the money Judas received to betray Jesus. (See: rc://en/ta/man/translate/writing-background)

thirty silver coins

Each of these coins were worth about four days’ wages.