It is narrated from Sayyiduna Abdullah bin Harith (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him and his family) would line up Sayyiduna Abdullah, Sayyiduna Ubaidullah, and several children from Banu Abbas, and then say to them: Whoever reaches me first will receive such and such a reward. So they would run towards him (peace and blessings be upon him and his family), and then climb onto his blessed back and chest, and he (peace and blessings be upon him and his family) would kiss them and embrace them.