'Vows' in the Bible

The Lord will make Himself known to Egypt, and Egypt will know the Lord on that day. They will offer sacrifices and offerings; they will make vows to the Lord and fulfill them.

At that time, they will worship with sacrifices and offerings, and they will make vows to the LORD and carry them out. The LORD will strike Egypt with a plague, striking but then healing. Then they will turn to the LORD, and he will respond to their pleas and heal them.