Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: I heard the Prophet (peace and blessings be upon him) say: "An angel descended upon me from the heaven who had not descended upon any prophet before me, nor will he descend upon anyone after me. He was Israfil, and with him was Jibril (peace be upon him). He said: 'Al-salamu alayka, O Muhammad!' Then he said: 'I am the messenger of your Lord to you. I have been ordered to tell you: if you wish, be a servant-prophet, and if you wish, be a king-prophet.' I looked at Jibril (peace be upon him), and Jibril gestured to me to be humble." Thereupon the Prophet (peace and blessings be upon him) said: "A servant-prophet." Then the Prophet (peace and blessings be upon him) said: "Had I said 'a king-prophet' and then wished, the mountains would have moved along with me as gold."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13252