1 Chronicles 2:15

Seventh. Syriac and Arabic add, "Eliu, (chap. xxvii. 18.) and the eighth David." It appears, in effect, the Isai had eight sons, and that David was the youngest, 1 Kings xvi. 10., and xvii. 12. The Rabbins suppose that one was only adopted, namely, Jonathan, the son of Samma, noted for his prudence and valour, 2 Kings xiii. 3., and xxi. 21. (Calmet) --- One might die in his youth, and be therefore omitted, (Tirinus) as he had done nothing memorable. (Du Hamel) --- The Scripture does not always specify the full number. (Abulensis)