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“And Moses spake unto the heads of the tribes concerning the children of Israel, saying, ‘This is the thing which the LORD hath commanded,
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.”  Numbers 30:1-2  (KJB)

REFERENCES: Numbers 30; Matthew 5:33-34; 14:7-9