Verse 13. - I will go into thy house with burnt offerings; I will pay thee my vows. In the old world the strict performance of vows was always held to be one of the main obligations of religion. A vow was of the nature of a compact with God, and to break it was an act of flagrant dishonesty, from which men shrank. The Mosaic Law sanctioned vows of various kinds, as the vowing of children to the service of God (Leviticus 27:1-8; 1 Samuel 1:11); the vow of the Nazarite (Numbers 6:2-21); and vows of clean or unclean animals (Leviticus 27:9-13, 27-29), etc. Clean animals, when vowed, must be either redeemed or sacrificed. The importance of performing vows is borne frequent witness to by the psalmists (see Psalm 22:25; Psalm 50:14; Psalm 56:12; Psalm 61:8; Psalm 65:1; Psalm 116:14, 18; Psalm 132:2).

66:13-20 We should declare unto those that fear God, what he has done for our souls, and how he has heard and answered our prayers, inviting them to join us in prayer and praise; this will turn to our mutual comfort, and to the glory of God. We cannot share these spiritual privileges, if we retain the love of sin in our hearts, though we refrain from the gross practice, Sin, regarded in the heart, will spoil the comfort and success of prayer; for the sacrifice of the wicked is an abomination of the Lord. But if the feeling of sin in the heart causes desires to be rid of it; if it be the presence of one urging a demand we know we must not, cannot comply with, this is an argument of sincerity. And when we pray in simplicity and godly sincerity, our prayers will be answered. This will excite gratitude to Him who hath not turned away our prayer nor his mercy from us. It was not prayer that fetched the deliverance, but his mercy that sent it. That is the foundation of our hopes, the fountain of our comforts; and ought to be the matter of our praises.I will go into thy house with burnt offerings,.... The psalmist here represents the saints and faithful in those times, who being delivered out of all their troubles, and brought into a large, free, plentiful, and comfortable condition, will come together into the place of public worship, and there unite in their sacrifices of praise to God; will come and present themselves as a whole burnt offering to the Lord; will come with hearts inflamed with love to God and one another, which is more than all whole burnt offerings and sacrifices, Mark 12:33;

I will pay thee my vows; thanksgivings promised in time of distress, as follows; see Psalm 50:14.