It is narrated from Sayyiduna Sa'd bin Ubadah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to him: "Take charge of the zakah of such-and-such a tribe, and take care that you do not come on the Day of Resurrection carrying on your neck or shoulder a young camel that is groaning." He said: O Messenger of Allah! Relieve me of this responsibility. So he (peace and blessings be upon him) relieved him of that responsibility.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5344