Exodus 3 and 4

In this chapters Moses is watching the flock of Jethro his father-in-law, and while he was watching them he saw a bush that was flaming but was not burning. When he saw this he went to see what he could learn about this bush,and when he did so god spoke to him from the bush saying to him to go to and free his people from hand of the Pharaoh. But even with of Moses's faith, he doubted that he could do what god asked, and every time god told him that he would be with Moses, Moses came up with another excuse. God even turned Moses's rod into a snake, but Moses still didn't believe he could free the Israelite. So god send Aaron to be Moses's speaker to the Egyptians. This just goes to show how even when God shows his power to us, we still don't completely trust him.