Reference for Numbers 1:16

אֵ֚לֶּה קריאי [קְרוּאֵ֣י] הָעֵדָ֔ה נְשִׂיאֵ֖י מַטּ֣וֹת אֲבוֹתָ֑ם רָאשֵׁ֛י אַלְפֵ֥י יִשְׂרָאֵ֖ל הֵֽם׃

These were the elect of the congregation, the princes of the tribes of their fathers; they were the heads of the thousands of Israel.