Hesabu 4 : 30 Numbers chapter 4 verse 30

tangu aliyepata umri wa miaka thelathini na zaidi, hata umri wa miaka hamsini, utawahesabu, kila atakayeingia katika huo utumishi, ili kufanya kazi ya hema ya kukutania.
soma Mlango wa 4

from thirty years old and upward even to fifty years old shall you number them, everyone who enters on the service, to do the work of the Tent of Meeting.