Sahih Muslim | Book 1 | Hadith Number 384
Narrated by Anas b. Malik
Anas b. Malik reported: The Messenger of Allah (may peace be upon him) said: I will come to the gate of Paradise on the Day of Resurrection and would seek its opening and the keeper would say: Who art thou? I would say: Muhammad. He would then say: It is for thee that I have been ordered, and not to open it for anyone before thee.