Albert Barnes Commentary Psalms 105:6

"O ye seed of Abraham his servant, Ye children of Jacob, his chosen ones." — Psalms 105:6 (ASV)

O ye seed of Abraham his servant, ye children of Jacob his chosen—All you who are descendants of Abraham and Jacob; the former is particularly mentioned here because he was the great ancestor of the Hebrew people; the latter, because the events referred to were closely connected with the history of Jacob—with his going down into Egypt and with the division of the tribes named after his sons. The word rendered "his chosen" seems in our version to refer to Jacob. In the original, however, it is in the plural number and must agree with the word rendered "children," "You chosen sons of Jacob" . So it has been translated in 1 Chronicles 16:13, Ye children of Jacob, his chosen ones.