Moses
Deuteronomy 23:21BSB·traditional attribution

If you make a vow to the LORD your God, do not be slow to keep it, because He will surely require it of you, and you will be guilty of sin.

John Calvin Reformed @genevareformer

21. When thou shalt vow a vow. The rule of vowing also pertains to the keeping of the Third Commandment, since, by vowing, men exercise themselves in the sanctification of God’s name, and to promise anything to God is a kind of swearing.

Matthew Henry Presbyterian @wholebiblehenry

Orders are here given about five several things which have no relation one to another: - I. The land of Israel is here made a sanctuary, or city of refuge, for servants that were wronged and abused by their masters, and fled thither for shelter from the neighbouring countries, Deu 23:15, Deu 23:16.

Commenting on Deuteronomy 23:15-25

John Gill Reformed Baptist @doctorgill

When thou shalt vow a vow unto the Lord thy God,.... Which must be of things in a man's power to perform, and of what are lawful to be done, and according to the mind and will of God revealed in his word, and agreeably to the manner of worship prescribed by him; as that he will offer such a sacrifice, a freewill offering to...