The “vow” was positive; the “bond” negative or restrictive. By a vow a man engaged to dedicate something to God, or to accomplish some work for Him: by a bond he debarred himself from some privilege or enjoyment. A vow involved an obligation to do: a bond, an obligation to forbear doing.
Related Commentaries of Numbers 30:2
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 breaka his word, he shall do according to all that proceedeth out of his mouth.