What was the response of Ubayy b. Ka'b when Prophet Muhammad (saw) told him that Allah had specifically mentioned his name?
 Anas reported Allah's Messenger (may peace be upon him) as saying to Ubayy b. Ka'b:                      Allah has commanded me to recite the Qur'an to you. He said: Did Allah mention me to you by name? He (the Holy Prophet) said: Allah made a mention of your name to me. (On hearing this) Ubayy b. Ka'b wept.