Two angels came to save Rot and his twp daughters, but his wife looked back and became a pillar of salt

 Genesis 19:1-

The two angels arrived at Sodom in the evening, and Lot was sitting in the gateway of the city. When he saw them, he got up to meet them and bowed down with his face to the ground.  “My lords,” he said, “please turn aside to your servant’s house. You can wash your feet and spend the night and then go on your way early in the morning.” No,” they answered, “we will spend the night in the square.”

But he insisted so strongly that they did go with him and entered his house. He prepared a meal for them, baking bread without yeast, and they ate. Before they had gone to bed, all the men from every part of the city of Sodom—both young and old—surrounded the house. They called to Lot, “Where are the men who came to you tonight? Bring them out to us so that we can have sex with them.”

“Get out of our way,” they replied. “This fellow came here as a foreigner, and now he wants to play the judge! We’ll treat you worse than them.” They kept bringing pressure on Lot and moved forward to break down the door.

But the men inside reached out and pulled Lot back into the house and shut the door. Then they struck the men who were at the door of the house, young and old, with blindness so that they could not find the door.

The two men said to Lot, “Do you have anyone else here—sons-in-law, sons or daughters, or anyone else in the city who belongs to you? Get them out of here, because we are going to destroy this place. The outcry to the Lord against its people is so great that he has sent us to destroy it.”

So Lot went out and spoke to his sons-in-law, who were pledged to marry his daughters. He said, “Hurry and get out of this place, because the Lord is about to destroy the city!” But his sons-in-law thought he was joking.

With the coming of dawn, the angels urged Lot, saying, “Hurry! Take your wife and your two daughters who are here, or you will be swept away when the city is punished.”

When he hesitated, the men grasped his hand and the hands of his wife and of his two daughters and led them safely out of the city, for the Lord was merciful to them. As soon as they had brought them out, one of them said, “Flee for your lives! Don’t look back, and don’t stop anywhere in the plain! Flee to the mountains or you will be swept away!”

By the time Lot reached Zoar, the sun had risen over the land. Then the Lord rained down burning sulfur on Sodom and Gomorrah—from the Lord out of the heavens. Thus he overthrew those cities and the entire plain, destroying all those living in the cities—and also the vegetation in the land. But Lot’s wife looked back, and she became a pillar of salt.

Why?

These cities were really full of sins, so the Lord decided to destroy everything in these cities.

Rot's two sons-in-law didn't believe what Lot said and thought he was joking. It is related to their life.

The wife of Rot still remembered the city she had lived in or liked to watch what was going on in these two cities. But she did not care about the warning of angels, so she lost her life and became a pillar of salt.

How?

Do the good and be a righteous man, and trust in the Lord. All of us sinners, trust in Jesus as our savior are the only way to be righteous men.