Firishta's History (Gulshan-i Ibrāhīmī) 6.8.8

6.8.8

On the third night, the King's nephew as usual came, and having whipped the husband severely, turned him into the street. The poor man hastened to the King, but the captain of the guards refused him admittance, saying that his Majesty was in the seraglio. The man immediately vociferated loudly, so that the porter, fearing the court might be disturbed, and the noise reach the King, was under the necessity of conducting him to the officers of the bed-chamber, who immediately acquainted Mahmood. The King instantly arose, and wrapping himself in a loose cloak, followed the man to his house. He found his nephew and the man's wife sleeping together in one bed, with a candle standing on the carpet near them. Mahmood, extinguishing the candle, drew his sword, and severed his nephew's head from his body. Then commanding the man to bring a light, he called for water, and having taken a deep draught, he told him he might now go and sleep with safety, if he could trust his own wife.