27 At the mouth of Aaron, and of his sons shall be all the service of the sons of the Gershonites, and all their burden, and all their service. And you shall lay a charge on them concerning the duty of all their burden.
Numbers 4:27 Cross References - LITV
Luke 1:70
70 even as He spoke through the mouth of His holy prophets from the age before :
1 Corinthians 11:2
2 But I praise you, brothers, that in all things you have remembered me, and even as I delivered to you, you hold fast the doctrines.