Rebellion & its consequences
Within weeks of receiving the 10 commandments & shouting "We will do everything the Lord has said. We will obey" , the Israelites abandoned God (and Moses). They made an image of a calf and called it their god. God decided to wipe out the Israelites, but Moses interceded reminding God of His promises to Abraham, Isaac & Jacob. Not only that, Moses offered to stand in as a redeemer "now please forgive their sin - but if not then blot me out of the book you have written." God had bigger plans than that, Jesus, God's son, would be the redeemer - not just for the Israelites, but for all people for all time. We are no better than the Israelites, but thanks to Jesus we can have all our sins forgiven if we turn to Him in repentance.