Ma'arif al-Qur'an Тафсир: Adh-Dhariyat Ая 31

When, in the course of the conversation, Holy Prophet Ibrahim (علیہ السلام) discovered that the guests were angels, he asked them what was their mission and they replied that they had been sent to the people of Lut (علیہ السلام) to destroy them as a punishment for their unspeakable crime. They would be stoned to death, but not with large stones.