Exodus 20:18-21  When the people saw the thunder and lightning and heard the trumpet and saw the mountain in smoke, they trembled with fear. They stayed at a distance and said to Moses, “Speak to us yourself and we will listen. But do not have God speak to us or we will die.” Moses said to the people, “Do not be afraid. God has come to test you, so that the fear of God will be with you to keep you from sinning.” The people remained at a distance, while Moses approached the thick darkness where God was. 

Exodus 16:4, 5 Then the LORD said to Moses, “I will rain down bread from heaven for you. The people are to go out each day and gather enough for that day. In this way I will test them and see whether they will follow my instructions. 5 On the sixth day they are to prepare what they bring in, and that is to be twice as much as they gather on the other days.”

Exodus 15:25-27 Then Moses cried out to the LORD, and the LORD showed him a piece of wood. He threw it into the water, and the water became fit to drink.
There the LORD issued a ruling and instruction for them and put them to the test. 26 He said, “If you listen carefully to the LORD your God and do what is right in his eyes, if you pay attention to his commands and keep all his decrees, I will not bring on you any of the diseases I brought on the Egyptians, for I am the LORD, who heals you.”
27 Then they came to Elim, where there were twelve springs and seventy palm trees, and they camped there near the water.

Exodus 12:1, 2 The LORD said to Moses and Aaron in Egypt, “This month is to be for you the first month, the first month of your year.

Exodus 7:13 Yet Pharaoh’s heart became hard and he would not listen to them, just as the LORD had said.