What does Psalm 66:13 mean?

The psalmist begins his personal conclusion to Psalm 66 with a promise to the Lord. He promises to enter the place of worship with sacrifices to honor God. He intends to also fulfill his other promises. Some burnt offerings were required by the Law (Leviticus 6:9–13), while others were voluntary and represented the worshiper's dedication to the Lord (Leviticus 1:13). Romans 12:1 exhorts believers to offer their bodies to God as a living sacrifice, "holy and acceptable." Having made this commitment to God, believers should obey His will.

Vows were to be taken seriously. They were a person's promises to God regarding his intention to obey God in specified matters. Numbers 30:2 holds a person accountable to fulfill his vows by saying, "If a man vows a vow to the LORD, or swears an oath to bind himself by a pledge, he shall not break his word. He shall do according to all that proceeds out of his mouth." The anonymous writer of this psalm had promised something to God during a time of personal trouble (Psalm 66:14); here, he declares his intent to make good on it (Numbers 30:2).