Psalms 105:6 - Albert Barnes' Notes on the Bible

O ye seed of Abraham his servant, ye children of Jacob his chosen - All you who are descendants of Abraham and Jacob; the former being 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” would seem 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,” “Ye chosen sons of Jacob” (compare Psalms 105:43). So it has been translated in 1 Chronicles 16:13, “Ye children of Jacob, his chosen ones.”