Uthman said: He could not vomit it, unless he did not drink it. He said to Ali: Inflict the prescribed punishment on him. Ali said to al-Hasan: Inflict the prescribed punishment on him.
Al-Hasan said: He who has enjoyed its pleasure should also bear its burden. So Ali said to Abdullah ibn Ja'far: Inflict the prescribed punishment on him. He took a whip and struck him with it while Ali was counting.
When he reached (struck) forty (lashes), he said: It is sufficient. The Prophet (ﷺ) gave forty lashes. I think he also said: "And Abu Bakr gave forty lashes, and Uthman eighty. This is all sunnah (standard practice). And this is dearer to me."
In-book : Book 40, Hadith 130
English translation : Book 39, Hadith 4465