The Messenger of Allah ﷺ said, "For every forty grazing camels, the due is a bint labun. Camels are not to be separated from their count for the sake of zakat. Whoever gives it seeking reward," Ibn Ala said, "seeking reward by it, will have his reward. Whoever withholds it, we shall take it from him along with half of his wealth, as a binding command from the commands of our Lord . The family of Muhammad has no share in it."
حدثنا موسى بن إسمعيل حدثنا حماد أخبرنا بهز بن حكيم ح و حدثنا محمد بن العلاء وأخبرنا أبو أسامة
أن رسول الله ﷺ قال في كل سائمة إبل في أربعين بنت لبون ولا يفرق إبل عن حسابها من أعطاها مؤتجرا قال ابن العلاء مؤتجرا بها فله أجرها ومن منعها فإنا آخذوها وشطر ماله عزمة من عزمات ربنا عز وجل ليس لآل محمد منها شيء
[Its isnad is hasan] Nasai narrated it in the Book of zakat, Chapter on the Punishment for Withholding Zakat, no. 2446, from the hadith of Bahz bin Hakeem, and Ibn Khuzayma graded it sahih, no. 2266, as did Hakim, 1/398, and Dhahabi agreed with him.