If you believe in Messenger(saw) then you must believe in this: The hadeeth of Saheeh Bukhaaree reported by Abu Hurayra (RA): "I have loved the people of the tribe of Bani Tameem, ever since I heard three things the Messenger of Allaah , sallallaahu alayhi wa sallam, said about them. I heard him saying, 'these people (of the tribe of Bani Tameem) would stand firm against the Dajjaal.' When the Saddaqat from that tribe came, the Messenger of Allaah , sallallaahu alayhi wa sallam, said, "these are the Saddaqat (charitable gifts) of our folk." Aa'ishah had a slave girl from that tribe, and the Prophet , sallallaahu alayhi wa sallam, said to Aa'ishah, 'manumit her as she is a descendant of Ismaa'eel, alayhis salaam.'" [Hadeeth no. 2543, 4366 of al-Fath] Ibn Hajr al-Asqalaanee said, "this hadeeth also contains a clear mention of the excellence and superiority of Bani Tameem." [Fath 5/217] The hadeeth of Ikrimah from one of the Companions reported in the Musnad of Imaam Ahmad and in it occurs, "do not say of Bani Tameem anything but good, for indeed they are the severest of people in attacking the Dajjaal." Al-Haythamee says: "its narrators are those of the Saheeh." [Mujma 10/48 chpt: What is reported concerning Bani Tameem]