John Gill Commentary Psalms 61:8

"So will I sing praise unto thy name for ever, That I may daily perform my vows." — Psalms 61:8 (ASV)

So will I sing praise unto your name for ever
Or constantly; and not only in this world, but in that to come, for the favours before mentioned; for hearing his prayers; giving him a goodly heritage; prolonging the King's life; and preparing mercy and truth to preserve him;

that I may daily perform vows ;
which is done by praising the Lord, giving him the glory of all mercies, as vowed and promised; see (Psalms 50:14) . The Targum adds, ``in the day of the redemption of Israel, and in the day that the King Messiah shall be anointed, that he may reign.''