Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: I brought the son of Sayyiduna Abu Talhah (may Allah be pleased with him), Abdullah, to the service of the Prophet (peace and blessings of Allah be upon him) so that you may give him tahneek (chew a date and rub it on the child's palate). I found the Prophet (peace and blessings of Allah be upon him) with a marking tool in his hand, and he was marking the camels of zakat with it.