Go and Bite Your Father's Penis!

What follows is an extract from my post Lovely Islamic Language

'Utayy ibn Damura said, "I saw with Ubay a man who was attributing himself (in lineage) with an attribution of Jahiliyyah, so Ubay told him to bite his father's male organ and did not speak figuratively (i.e. was explicit). So his companions looked at him. He said, 'It appears that you disapprove of it.' Then he said, 'I will never show apprehension to anyone with regards to this. Verily, I heard the Prophet, may Allah bless him and grant him peace, say, "Whomever attributes himself (in lineage) with an attribution of Jahiliyyah, then tell him to bite his father's male organ and do not speak figuratively (i.e. be explicit)." '

https://sunnah.com/adab:963 

It was narrated from Ubayy ibn Ka‘b that a man boasted in an ignorant manner of his tribal lineage, so he told him to bite his father’s male member, and he did not use a metaphor. The people looked askance at him, so he said to the people: I can see what you are thinking, and I can only say this: that the Messenger of Allah (blessings and peace of Allah be upon him) instructed us: “If you hear someone boasting in an ignorant manner of his tribal lineage, then tell him to bite his father’s male member, and do not use a metaphor.”

Narrated by Ahmad (35/157); classed as hasan by the commentators on al-Musnad.

It was narrated from Ubayy (may Allah be pleased with him) that a man boasted of his tribal lineage, and Ubayy told him to bite his father’s male member, and they said: You were never given to obscene speech! He said: We were instructed to do that.

Narrated by Ahmad (35/142); classed as hasan by the commentators on al-Musnad and as saheeh by al-Albaani in Saheeh al-Jaami‘.

Detailed discussion about the hadith “Tell him to bite his father’s male member” and refutation of those who say that this is gratuitously obscene speech - Islam Question & Answer