﴿ لِنُرْسِلَ عَلَيْهِمْ حِجَارَةًۭ مِّن طِينٍۢ ﴾

“to let loose upon them stone-hard blows of chastisement,”

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.