Mustadrak al-Hakim — Hadith 1464

Sayyiduna Bahz bin Hakim narrates from his father, and he from his grandfather (Sayyiduna Mu'awiyah bin Haydah (may Allah be pleased with him)), that he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "For every forty grazing camels, one two-year-old she-camel (bint labun) is due. Camels are not to be separated in the calculation of zakah. Whoever gives it seeking reward will have its reward, and whoever withholds it, we will take the zakah from him and also take half of his camels (as a penalty). This is one of the firm decrees of our Lord, and nothing of it is lawful for the family of Muhammad (peace and blessings be upon him)."
The chain of this hadith is sahih (authentic), in accordance with what we mentioned earlier about the authenticity of this scroll, but the two Shaykhs did not record it.