Numbers 30:1
"And Moses spake unto the heads of the tribes concerning the children of Israel, saying, This is the thing which the LORD hath commanded."
Cross References (ranked by relevance)
Numbers 7:2
That the princes of Israel, heads of the house of their fathers, who were the princes of the tribes, and were over them that were numbered, offered:
Exodus 18:25
And Moses chose able men out of all Israel, and made them heads over the people, rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.