Genesis 19 - 21

God sent two angels to get Lot out of Sodom before destroying it. Lot recognized them as angels, and asked them to come into his home to spend the night. The other worldly men of Sodom did not recognize them as being from the Lord, because they were unspiritual and living in darkness. They came to Lot's house and demanded he send them out so they could have homosexual sex with them. Lot refused, but offered his virgin daughters to them instead. Lot was saved, but totally backslidden.
When Lot withstood their advances, they accused him of sitting in judgment over them, just as the homosexual of today does when one tries to point out to them they are acting contrary to God's Word. The angels then pulled Lot back into the house and blinded the men at the door, which threw them into confusion. The angels warned Lot to gather his family and leave Sodom.
Some of Lot's daughters had married men of Sodom, but they scoffed at him when he tried to get them to leave sin city. So he grabbed the two daughters who remained in his home and his wife, and began to flee. They were told not to even look back at what they were leaving, but Lot's wife was reluctant to leave her life in Sodom, and she cast a longing look back at the life of sin from which they were being miraculously saved. She became a pillar of salt.
It strikes me here that this is a word picture of how we are saved from sin. God may perform a miracle to save us, and we are told not to look back longingly on our former life of sin, but sometimes we do, and our hearts become a little harder each time.
Lot was told to flee to the mountains, but he had lived in the city for so long, he was frightened of country life, and begged the angels to let him flee to Zoar, a smaller city, to which they assented. But he became terrified after seeing what God did to Sodom and Gomorrah, so he took his two daughters and moved to the mountains to become a cave dweller, as the angels had urged him. He became a recluse, brooding about the turn his life had taken.
Sexual sin again prevails in Lot's story at this point, resulting in two tribes being born whose people would be a thorn in Israel's side for centuries. Lot's daughters, fearing there would be no husbands for them, got their father drunk and had sex with him, resulting in both becoming mothers of sons. One son was named Moab, who grew to become the head of the Moabites, and the other, Benammi, who became the patriarch of the Ammonites. Both tribes became arch enemies of the Hebrews.
Thus, the sordid tale of Lot's life ends. Lot was a miserable excuse for a man, who knew God, but was just worthless and weak. He should not have chosen for himself the best land, moved into Sodom, where he became an important city council member, and he should have trained his offspring in the ways of the Lord, none of which he did. He also should have been proactive about making a good home and finding good husbands for his two daughters.
Abraham seems to have just given up on Lot at this point (Chapter 20) and decided to move on with his life. He moved off to the south of Jerusalem, pitching his tent on land claimed by King Abimelech, where he repeated the same sin he committed in Egypt. Fearing for his life, he told the king Sarah was his sister. Sarah must have still been a real beauty at her advanced age, because the king gathered her into his harem.
God sent King Abimelech a bad dream, warning him against going near Sarah, and that she was, indeed, Abraham's wife. Abimelech chewed out both Abraham and Sarah and sent them packing, although again giving them great riches to take along. It was immediately after this episode that Sarah became pregnant with Isaac, delivering him according to the exact time line prescribed by God. And Sarah laughed, this time with delight, but it wasn't long until she was angry again at her servant, Hagar, and her child, Ishmael, who had been taunting Isaac.
Again, Sarah complained to Abraham of the situation, and insisted he run the slave woman and her son out of the tribe. This time Abraham brooded about the situation, as he had become fond of his son, Ishmael. In visiting with God about the problem, God told him to listen to Sarah this time, and send Hagar and Ishmael away. God knew if they stayed, it would only cause chaos in his chosen tribe, and He also promised Abraham to provide for Hagar and Ishmael, making it easier for Abraham to lead them out into the desert to leave them there with a little food and water.
Still Hagar thought they would die and prepared again to do so. Again, Jesus called out to Hagar that He would be providing for her, which He did by causing a water well to appear immediately. In fact, it seems Hagar and Ishmael were very well provided for as they lived in the wilderness.
Abraham was also being blessed by God, which was not lost on his neighbors. They noticed, just as our neighbors do today when we are living under God's umbrella of protection. So King Abimelech came to make a treaty with Abraham. It seems the two peoples had been fighting over water in that hot, dry land, but they were able to come to a peace agreement.