Ellicott's Commentary On The Whole Bible
Psalms 105 - Introduction
CV.
The motive of this historical psalm is plainly declared in Psalms 105:44, and the scope which the author allowed himself in the survey of the past appears in Psalms 105:11. He wishes this generation to remember that the continued possession of the Promised Land is contingent on obedience to the covenant God. In fact, the psalm is an elaboration of the charge so often repeated in the Book of Deuteronomy: “For the Lord thy God shall greatly bless thee in the land which the Lord thy God giveth thee for an inheritance to possess it, only if thou carefully hearken unto the voice of the Lord thy God to observe to do all these commandments which I command thee this day “(Deuteronomy 15:4).
The psalm dates from a time prior to the composition of the first Book of Chronicles, for it forms part of the compilation of song in chapter 16; but there is no other indication by which to assign date or authorship. The conjecture is probable that it was compiled for liturgic use soon after the re-settlement in the country after the Captivity. The parallel structure, which is of the synthetic kind, alone gives it a claim to rank with poetry.