Psalms 56:12

12. Thy vows are upon me He reaffirms all his previous vows. They are as sacredly binding here in Gath as in his own land in exile as in the congregation of the saints. This reminding God that he still held to his vows, leaves the fulfilment of the promises wholly depending upon the divine veracity.

I will render praises The form of speech offer thanksgiving is sacrificial, meaning praise or thanksgiving as a sacrifice, or, as in Hosea 14:2, “the calves of our lips.” See Hebrews 13:15. As the promise of “thank offering” immediately follows the mention of his vows, it is probably the votive offering which he promises, which was due after the condition of the vow had been met, and the blessing prayed for granted. This David waits for in faith.