Numbers 12:1 And Miriam and Aaron spake against Moses because of the Ethiopian woman whom he had married: for he had married an Ethiopian woman. 2 And they said, Hath the Lord indeed spoken only by Moses? hath he not spoken also by us? And the Lord heard it.
The question of authority arose with Moses and Aaron, when they gave out instructions God spoke to them which were not written. The question that would always arise is in the minds of some is whether or not they should obey, as if it came from God, or may be, just may be, Moses was taking it upon himself to give out arbitrary instructions. But laws and instructions coming from God do not necessarily have to be written in stone, for them to be valid.
The question of authority also arose in the days of the early Christian church, when Paul baptized the gentiles without them being circumcised. In those instances, persons who were rigidly tethered to it is written brought scripture to back up their argument and peter and Paul found themselves having to defend what they did with only it is spoken.
The fact of the matter is that it took many centuries for laws to be written, because they were passed down from generation to generation by word of mouth, and those who were thus instructed were expected to obey, just as if the laws were written in stone. As parents, we do not have to write down any of he laws and instructions we give to our children, for our word to be binding. All we need to do is to speak the word.
Colossians 3:20 Children, obey your parents in all things: for this is well pleasing unto the Lord.
May God add His blessing to the study of His word. “Good night” and God bless!