Charles Ellicott Commentary Psalms 91:9

"For thou, O Jehovah, art my refuge! Thou hast made the Most High thy habitation;" — Psalms 91:9 (ASV)

You ... my.—The difficulty of the change of person is avoided by the Authorized Version, but only with violence to the text, which runs, “For you, Jehovah, my refuge; you have made the Most High your habitation.”

It is best to take the first line as a kind of under-soliloquy. The poet is assuring himself of the protection that will be afforded to one who trusts in God; and he interrupts his soliloquy, as it were, with a comment upon it: “Yes, this is true of myself, for You Jehovah are indeed my refuge.” (For the Most High as a dwelling place, see Psalms 90:1.)