Moses spake unto the heads of the tribes The chief rulers of each tribe, who were to communicate it to the rest. This is the thing the Lord hath commanded With relation to vows, concerning which, it is probable, some case had been proposed to him to be determined.
Related Commentaries of Numbers 30:1
Numbers 30:1
1 And Moses spake unto the heads of the tribes concerning the children of Israel, saying, This is the thing which the LORD hath commanded.