Rashi
Jewish
1040–1105
“David the seventh This is written with the plene spelling, with a “yud,” because of David’s honor, and now he found the pearl; therefore, he did not count the eighth [son], Elijah.”
From the early Church Fathers to now.
1 Jewish · 1 Catholic · 1 Reformed
“The sixth Asom, the seventh David.”
“David the seventh This is written with the plene spelling, with a “yud,” because of David’s honor, and now he found the pearl; therefore, he did not count the eighth [son], Elijah.”
“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)”
“CHILDREN OF JESSE. (Ch1 2:13-17) David the seventh--As it appears (Sa1 16:10; Sa1 17:12) that Jesse had eight sons, the presumption is from David being mentioned here as the seventh son of his father, that one of them had died at an early age, without leaving issue.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.