Matthew Poole and continuators on Numbers 30:2

2 If a man vow a vow unto the LORD , or swear an oath to bind his Soul with a bond , he shall not break his word , he shall do according to all that proceedeth out of his own mouth .

Which notes both the Sex, as appears by v. 3. and the Age, that he be grown up, for none can be so weak as to think the vow of a young Child would bind it.

i. e. A simple vow to do something possible and lawful.

To the Honour and Service of God.

Confirm his Vow by an Oath.

To restrain himself from something otherwise lawful, as suppose from such a sort of Meat or Drink; or to oblige himself to the performance of something otherwise not necessary, as to observe a private day of fasting.

Heb. not pollute, or prophane his word, as the same phrase is used, Psal. 55. 20. and 89. 34. i. e. not render his word, and consequently himself prophane, or vile and contemptible in the eyes of others.

And that without delay, Deut. 23. 21. Eccles. 5. 4. provided the thing be not unlawful and forbidden by God, Act. 23. 14. for it is an idle conceit that a man can give away Gods right, or that he can make void Gods commands by his own vows, which was the dotage of the Pharisees, Mark 6. 23, 26.

Marginal references: Heb. profan[illegible: 1+ letters].