Matthew Poole and continuators on Psalms 105:8

8 He hath remembred his covenant for ever, the word which he commanded to a thousand generations .

Practically, so as to perform it; as that word is frequently used in Scripture.

The word of promise or the Covenant, as is explained both in the foregoing and following words. And so the word is taken, Iudg. 13. 12. Luke 1. 38.

i. e. Established or ordained or appointed, as this word is oft taken, as Psal. 68. 28. & 71. 3. & 133. 3. Isai. 13. 3. & 23, 11.

To all generations; a certain number being put for an uncertain. He seems to allude to that passage, Exod. 20. 6.