Harithah bin Mudarrib came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and said: There was no enmity between me and any of the Arabs. When I passed by a mosque of Banu Hanifah, they had come to believe in Musaylimah. So Sayyiduna Abdullah (may Allah be pleased with him) summoned them and asked them to repent. Only Ibn al-Nawwahah did not repent. Sayyiduna Abdullah (may Allah be pleased with him) said to him: I heard the Messenger of Allah (peace and blessings be upon him) say: "An envoy is not to be killed"; otherwise I would have struck off your neck. But today you have not come as an envoy. Then he gave the order to Qarazah bin Ka'b (may Allah be pleased with him), and he struck off his neck in the market. Then he said: Whoever wishes to see Ibn al-Nawwahah lying slain in the market may see him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18777