1 Chronicles 23:24

24. Twenty years and upward this is not to be explained by supposing an error in the text of 1 Chronicles 23:3, (Kiel,) nor by assuming that David first took a census of those thirty years of age and upward, and afterwards another census of those twenty years old and upwards. The writer introduces additional information, and explains in the verses following, that since Jehovah had given rest to his people, and the tabernacle was to be carried about no more, the Levites might begin to serve at an earlier age, and accordingly David ordained among his last instructions, (1 Chronicles 23:27,) that the Levites might be numbered for service at the age of twenty a practice which afterwards prevailed. 2 Chronicles 31:17; Ezra 3:8.