C. F. Keil and Franz Delitzsch on Ezra 3:4

Ezr 3:4

They kept the feast of tabernacles as prescribed in the law, Lev 23:34. “The burnt-offering day by day, according to number,” means the burnt-offering day by day, according to number,” means the burnt-offerings commanded for the several days of this festival, viz., on the first day thirteen oxen, on the second twelve, etc.; comp. Num 29:13-34, where the words כּמשׁפּט בּמספּרם, Num 29:18, Num 29:21, Num 29:24, etc., occur, which are written in our present verse כּם בּמספּר, by number, i.e., counted; comp. 1Ch 9:28; 1Ch 23:31, etc.