When the Israelites were set free, God committed to a relationship with them where God would continue to provide for them, protect them, care for them, and lead them well. This covenant commitment would work well as long as Israel would trust God and walk in His ways. We know, however, that they did not do that. In fact, the parents are in the wilderness teaching their children because they did not trust God. They were saved from the sins of others in Egypt. They were not saved, however, from their own sins against God.
Later on, when the future generations did follow God and go into the Promised Land, the Israelites enjoyed the benefits and blessings that went along with walking together with God. Over time, though, they walked away from Him again. One again, the Israelites were not being saved from their own rebellion. This is when God made a promise to the Israelites that we still hear today.
"The days are coming," declares the LORD, "when I will make a new covenant with the people of Israel and with the people of Judah. It will not be like the covenant I made with their ancestors when I took them by the hand to lead them out of Egypt, because they broke my covenant, though I was a husband to them," declares the LORD. "This is the covenant I will make with the people of Israel after that time," declares the LORD. "I will put my law in their minds and write it on their hearts. I will be their God, and they will be my people. No longer will they teach their neighbor, or say to one another, 'Know the LORD,' because they will all know me, from the least of them to the greatest," declares the LORD. "For I will forgive their wickedness and will remember their sins no more." (Jeremiah 31:31-34 NIV)
God promised to save Israel and Judah. This promise was made for us as well. Remember, God promises to save.