Qarun was from the people of Musa, but he oppressed them. Allah had given him so many treasures that even their keys were a burden for a band of strong men.
His people said to him: do not exult; Allah does not love the exultant.
Qarun said: I was given this only because of the knowledge I have. One day he went out before his people in all his finery. Those who wanted this world said: if only we had what Qarun has been given! But those who had knowledge said: woe to you, Allah's reward is better for whoever believes and does good.
Then Allah caused the earth to swallow Qarun and his house. No one could help him. Those who had wished for his place the day before said: Allah gives abundantly to whom He wills and restricts it; had Allah not been gracious to us, He would have swallowed us too.