
As quoted in Ta'Rikh-i-Jahan Gusha [History of the World Conqueror] by 'Ala-ad-Din 'Ata-Malik Juvaini (ca. 1252-1260), translated by J.A. Boyle (1958), p. 105
Context: O people, know that you have committed great sins, and that the great ones among you have committed these sins. If you ask me what proof I have for these words, I say it is because I am the punishment of God. If you had not committed great sins, God would not have sent a punishment like me upon you.