"That the Prophet to you.' Abu Musa gave him a cushion to sit down, then a man was brought who had been a Jew, then he became a Muslim, then he reverted to Kufr. Mu'adh said: 'I will not sit down until he is killed; this is the decree of Allah and His Messenger,' (saying it) three times. When he was killed, he sat down."
Sunan an-Nasa'i Book 37, Hadith 101
← Previous Hadith 'Ali came to some people of Az-Zutt, who worshipped idols, and burned them. Ibn 'Abbas said: "But the Messenger of Allah said: 'Whoever changes his religion, kill him.'"

Sunan an-Nasa'i Book 37, Hadith 100 Next Hadith → "On the day of the Conquest of Makkah, the Messenger of Allah . He ('Uthman) said: 'O Messenger of Allah! Accept the allegiance of 'Abdullah.' He raised his head and looked at him three times, refusing his allegiance each time, then he accepted his allegiance after three times. Then he turned to his Companions and said: 'Was there not any sensible man among you who would get up when he saw me refusing to give him my hand and kill him?' They said: 'We did not know, O Messenger of Allah, what was in your heart. Why did you not gesture to us with your eyes?' He said: 'It is not befitting for a Prophet that his eyes be deceitful.'"

Sunan an-Nasa'i Book 37, Hadith 102