Jamieson, Fausset and Brown on Ezra 8:24-32

24-32. Then I separated twelve of the chief of the priests ... and weighed unto them the silver, &c.--The custody of the contributions and of the sacred vessels was, during the journey, committed to twelve of the chief priests, who, with the assistance of ten of their brethren, were to watch closely over them by the way, and deliver them into the house of the Lord in Jerusalem. The treasures in silver and gold, according to the value of the Babylonian talent, amounted to about £515,000 sterling.