Num 30.2 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 mouth.
2Sam 18.19-31 Then said Ahimaaz the son of Zadok, Let me now run, and bear the king tidings, how that the LORD hath avenged him of his enemies.