Psalm 105:9

Which covenant he made with Abraham, and his oath unto Isaac;

Which covenant he made with Abraham,.... Or made it known unto him, and showed him his particular interest in it; promised that he would be his God, that he would bless him; and that in his seed, the Messiah, that should spring from him, all nations of the earth should be blessed, Genesis 12:2, compare with this Luke 1:72.

and his oath unto Isaac: he made known to Isaac the oath which he swore to Abraham, and promised to perform it, Genesis 26:3, or concerning Isaac {a}; in whom his seed was to be called, and in whose line from him the Messiah was to come, the grand article of this covenant.

{a} qxvyl de Isahac, Vatablus.