Whoever reviles the Prophet (peace and blessings be upon him) is to be killed

It is narrated from Sayyiduna Abu Barzah (may Allah be pleased with him) that Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) became very angry with a man. I said: O Successor of the Messenger (Khalifat Rasul Allah)! Who is he? He asked: Why? I said: So that, if you order me, I may strike off his head. The narrator says that Sayyiduna Abu Bakr (may Allah be pleased with him) said: Would you really have done it? I said: Yes. And by Allah! This statement of mine took away his anger. Then he said: (This status) belongs to no one after Muhammad (peace and blessings be upon him).
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.

It is narrated from Sayyiduna Abu Barzah al-Aslami (may Allah be pleased with him) that a man spoke harshly to Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him). I said: O Successor of the Messenger! Shall I not kill him? He said: This (authority) is for no one except in the case of someone who insults the Prophet (peace and blessings be upon him).

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whomever you find committing the act of the people of Lut, kill both the one who does it and the one to whom it is done." Sulayman bin Bilal said: I heard Yahya bin Sa'id and Rabi'ah saying that whoever commits the act of the people of Lut is to be stoned, whether he is married or unmarried.
This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever commits the act of the people of Lut, stone both the one who does it and the one to whom it is done."