My glory— That is, his tongue, as St. Peter explains it, Acts 2:26.; for the Hebrews give the tongue the name of glory, as Psalms 57 because it was bestowed upon us to glorify God; and because it is our glory, as being the instrument of expressing our thoughts by words. My flesh shall rest in hope, means, "My body shall rest in the grave; with an assurance that it shall soon come forth from thence by a happy resurrection."
Related Commentaries of Psalms 16:9
Psalms 16:9
9 Therefore my heart is glad, and my glory rejoiceth: my flesh also shall restb in hope.