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-reference
Numbers 1:4–16
Historical context
In Numbers 1:4-16, these heads of the tribes are named — the same leaders Moses addresses here.
Numbers 7:2
Historical context
In Numbers 7:2, these same heads of the tribes bring offerings — identifying them as the tribal leaders.
Numbers 34:17–28
Historical context
In Numbers 34:17-28, these leaders are appointed to divide the land — same group of tribal heads.