Which covenant he made with Abraham - Which he “ratified” with Abraham. Literally, “which he cut with Abraham.” Genesis 17:2-14. Compare the notes at Psalms 50:5.
And his oath unto Isaac - Confirming the promise made to Abraham. See Genesis 26:2-5.
Related Commentaries of Psalms 105:9
Psalms 105:9
9 Which covenant he made with Abraham, and his oath unto Isaac;