Psalm 91 is one of sixteen psalms that are called Messianic Psalms; they are prophetic psalms revealing the Messiah (Christ Jesus) to come. Psalms 2, 8, and 22 are three that you may know.
“A prayer of Moses the man of God.” “Lord, You have been our dwelling place in all generations. Before the mountains were brought forth, or ever You had formed the earth and the world, even from everlasting to everlasting, You are God.” Psalm 90:1-2.
“…who [Jesus, God the Son], being in the form of God, did not consider it robbery to be equal with God, but made Himself of no reputation, taking the form of a bondservant, and coming in the likeness of men. And being found in appearance as a man, He humbled Himself and became obedient to the point of death, even the death of the cross. Therefore God also has highly exalted Him and given Him the name which is above every name, that at the name of Jesus every knee should bow, of those in heaven, and of those on earth, and of those under the earth, and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.” Philippians 2:6-11.