It is narrated from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that a man was attributed with an association from the time of ignorance (Jahiliyyah). Sayyiduna Ubayy (may Allah be pleased with him) told him to bite his father's private part, and he did not speak figuratively. The people looked at him with astonishment because of this insult, but he said: I know what you are feeling within yourselves, while I only have the ability to say this much, because the Messenger of Allah (peace and blessings be upon him) commanded us, saying: When you see someone being attributed to the associations of Jahiliyyah, then say to him without any hint or innuendo: Bite your father's private part.