1 Esdras 1:13-16
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13 And set them before all the people: and afterward they prepared for themselves, and for the priests their brethren, the sons of Aaron.
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14 For the priests offered the fat until night: and the Levites prepared for themselves, and the priests their brethren, the sons of Aaron.
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15 The holy singers also, the sons of Asaph, were in their order, according to the appointment of David, to wit, Asaph, Zacharias, and Jeduthun, who was of the king's retinue.
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16 Moreover the porters were at every gate; it was not lawful for any to go from his ordinary service: for their brethren the Levites prepared for them.