The Children of Israel had crossed the Red Sea and celebrated their escape from Pharaoh's clutches but now, after three days of travelling in the desert with no water, they were thirsty. Finally they found water, but it tasted horrid. That's when the grumbling started. "What are we to drink?" they asked.
Moses turned to God. "What are they to drink?" he asked. God showed him a piece of wood and told him to throw it into the bitter waters. Amazingly, it now tasted great.
"There the Lord made a decree and a law for them, and there he tested them. He said, 'If you listen carefully to the voice of 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.'"
"If you listen." God had a condition to his promise. "I won't treat you like I did the Egyptians, if you listen." The condition was bigger than just listening--they had to listen, do what was right in God's eyes, pay attention to his commands and obey them--but it began with listening.
God still expects and waits for his people to listen to him. This is the key to relationship with God. We must listen. Do you?