Ezra 1:4 (ESV)

4 And let each survivor, in whatever place he sojourns, be assisted by the men of his place with silver and gold, with goods and with beasts, besides freewill offerings for the house of God that is in Jerusalem.”

Not all the Jews wanted to return to Jerusalem. They were therefore encouraged to assist those who did. Each colony of Jews could support any from among them who were making the journey to Jerusalem. They could support them by giving money, food, water, and/or animals for the journey.