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.
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Ambrose of Milan
AD 397
A vow is a request for a benefit from God with a promise to give something in return. Hence, when you have obtained what you sought, it would be an ungrateful act to delay what you have promised. .
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)
