When you shall vow a vow unto the LORD your God, you shall not delay to pay it: for the LORD your God will surely require it of you; and it would be sin to you.
All Commentaries on Deuteronomy 23:21 Go To Deuteronomy 23
George Leo Haydock
Delay, beyond the time appointed. (Menochius)
If no time was specified, the vow must be fulfilled without any unnecessary procrastination. See Numbers xxx. 2. (Haydock)
Vows induce an obligation which before did not exist. (Worthington)