Psalmów 116:14 Midrasz: Midrash Tehillim

I will fulfill my vows to the Lord. Rabbi Yehuda says (Ecclesiastes 5:3): 'It is better not to make a vow than to make one and not fulfill it.' It is better not to vow at all, as it is said (Deuteronomy 23:23): 'When you make a vow to the Lord your God, do not be slow to pay it, for the Lord your God will surely demand it of you, and you will be guilty of sin.' Rabbi Meir says: It is better to vow and fulfill, as it is said (Psalm 76:12): 'Make vows to the Lord your God and fulfill them.'"...