Exo 18:23: In Acts 6:1-6, the Apostles have issues in the assembly (ekklesia) that needed attention, but the Apostles did not have the time to deal with them. So they used the model described here in Torah as a solution. They appointed men to handle the smaller matters so the Apostles could deal with their duties to Elohim.
The Angel of Yahweh appeared to Moses in a blazing fire in the midst of a bush. The bush was burning, but it was not consumed. This is probably the same fire that Yahweh appeared as when He made His covenant with Abraham (Gen. 15:13-17).