Abdullah bin Umar (may Allah be pleased with them) narrates: The Prophet Muhammad (peace be upon him) sent Sa’d bin Ubadah to collect Zakat. The Prophet (peace be upon him) said: O Sa’d! Try to avoid bringing such a camel on the Day of Resurrection that is groaning. He (Sa’d) said: Neither will I find it nor will I bring it. So the Prophet (peace be upon him) did not assign him this responsibility.