en_obs-tn/content/38/02.md

One of Jesus’ disciples was a man named Judas. Judas was in charge of the apostles’ moneybag, but he often stole money out of the bag. After Jesus and the disciples arrived in Jerusalem, Judas went to the Jewish leaders. He offered to betray Jesus by handing him over to them in exchange for money. He knew that the Jewish leaders did not accept that Jesus was the Messiah. He knew that they wanted to kill him.

This is background information about Judas and his arrangement to betray Jesus. (See: rc://en/ta/man/translate/writing-background)

in charge of the apostles’ moneybag

That is, “responsible to hold the apostles’ money” or, “responsible to hold the bag that had the disciples’ money in it and to distribute funds from it.”