Albert Barnes Commentary Psalms 105:8

"He hath remembered his covenant for ever, The word which he commanded to a thousand generations," — Psalms 105:8 (ASV)

He has remembered His covenant forever - That is, God has kept it constantly in remembrance, or always. Compare the notes on Luke 1:72.

Though the covenant was made long ago, and though many generations of people have passed by, great changes have occurred, and many calamities have come upon the nations, yet His ancient covenant and promise have never been forgotten. All His promises have been fulfilled; all will always be. The “covenant” referred to here is that which was made with Abraham, and through him with the Hebrew people.

The word which He commanded - This refers to the thing which He commanded; that is, all that He ordained and appointed.

To a thousand generations - This means very many generations, or any number of generations; that is, always. Compare Exodus 20:6.

The experience of the people through all the generations of their history has shown that in what He has promised and directed, He is unchanging.