"Moses reported this to the Israelites, but they did not listen to him because of their discouragement and harsh labor." NIV translation
Moses was faithful to tell the people of God about His complete deliverance from their current situation but they did not believe him. We see that two reasons are given and that is their attitude and their busyness. This was what Pharaoh had hoped for when he increased their workload and it is also a tactic that is used today. God still promises us deliverance from the things that hold us in bondage but we have to grab ahold of His promise and power through faith (trust) in Him and His power. Our freedom from that bondage has to be our number one priority.
"Then the Lord said to Moses, 'Go, tell Pharaoh king of Egypt to let the Israelites go out of his country.' But Moses said to the Lord, 'If the Israelites will not listen to me, why would Pharaoh listen to me, since I speak with faltering lips?'" NIV translation
Even though the Israelites did not believe God and Moses, God still told him to go to Pharaoh.
Moses' reply was to wonder why Pharaoh would listen when his own people would not. He was still looking at his strength instead of trusting in God.
That is what the devil tries to get us to do as Christians. When we focus on ourselves and our own abilities, we lose track of the fact that God has already taken care of our infirmities. With our eyes focused on His promised deliverance, we can walk in true freedom.
"Now the Lord spoke to Moses and Aaron about the Israelites and Pharaoh king of Egypt, and he commanded them to bring the Israelites out of Egypt." NIV translation
It is always good to know who you are getting a message from and, here, we are reminded that it is God speaking through Moses and Aaron. What follows is a partial family tree so that the Israelites would know who these two men were. It is just as important for us today to know who we are listening to as there are many false prophets in the world today.