Discipline in Church

When God called Abraham, they were very few. Every offered. But as people grew in Egypt, God brought a discipline by making order of Priesthood and laws, etc. Moses knew Priesthood in Egypt religion is very Honorable, so he thought of Levites also. 

So is New Testament church. Though early desciples all are priests and went around to share Gospel. As it grew discipline, Liturgy, leadership, etc..came in Church. .

Israelis Rebellion

People of Israel when they left Egypt, they looted the wealth of Egypt. When they were rich they tried to be independent and proud. Of course there were some Egyptians and other  slaves migrated with Israeli people. They forgot to be humble when they have riches they lusted after food and comfor. They had money and forgot God