Sahih Bukhari Volume 8, Book 78, Hadith Number 631.
Narated By Abu Humaid As-Sa’idi : Allah’s Apostle employed an employee (to collect Zakat). The employee returned after completing his job and said, “O Allah’s Apostle! This (amount of Zakat) is for you, and this (other amount) was given to me as a present.” The Prophet said to him, “Why didn’t you stay at your father’s or mother’s house and see if you would be given presents or not?” Then Allah’s Apostle got up in the evening after the prayer, and having testified that none has the right to be worshipped but Allah and praised and glorified Allah as He deserved, he said, “Now then ! What about an employee whom we employ and then he comes and says, ‘This amount (of Zakat) is for you, and this (amount) was given to me as a present’? Why didn’t he stay at the house of his father and mother to see if he would be given presents or not? By Him in Whose Hand Muhammad’s soul is, none of you will steal anything of it (i.e. Zakat) but will bring it by carrying it over his neck on the Day of Resurrection. If it has been a camel, he will bring it (over his neck) while it will be grunting, and if it has been a cow, he will bring it (over his neck), while it will be mooing; and if it has been a sheep, he will bring it (over his neck) while it will be bleeding.” The Prophet added, “I have preached you (Allah’s Message).” Abu Humaid said, “Then Allah’s Apostle raised his hands so high that we saw the whiteness of his armpits.”