Musannaf Ibn Abi Shaybah 30256 — A man who insinuates a false

Muhammad bin Ishaq said: Al-Qasim was asked about a man who says to another man: O son of a tailor, or O son of a cupper, or O son of a butcher, while his father is no such thing: what is the ruling on him? At this al-Qasim said: We found that the prescribed punishments were not carried out except in the case of a clear accusation or a clear denial (of lineage).