Exodus 7:6-9 - They did just as the Lord commanded them

7:6,7

Moses and Aaron did just as the Lord had commanded them, this was despite their misgivings. Just like Peter and the others when Jesus told them to cast their nets over the other side, despite the night’s fruitlessness. Peter thought it was a waste of time, but because Jesus had said so they agreed to do what Jesus said. Faith is often the act of obedience, rather than a feeling. Moses was eighty at this time, and Aaron eighty three. So far God had limited the age of man to one hundred and twenty years old.

7:8,9

God gave quite explicit commands and information to Moses. Sometimes God does give detailed information, sometimes He doesn’t! We must not make any hard and fast rule on this matter. Abraham was called to leave his land, but was not told where he would be going (Heb 11:8). Pharaoh would demand that they prove themselves, and at this point Aaron is to cast his staff down on the ground and it would become a serpent.