It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, Allah Almighty divided creation into two parts, and He placed me in the better of the two parts, that is, among the people of the right, and I am the best of the people of the right. Then He divided the two parts into households, and placed me in the best household among them. That is the meaning of His saying: 'Then the people of the right, what are the people of the right? And the people of the left, what are the people of the left? And the foremost are the foremost', and I am the best of the foremost. Then He divided that household into tribes, and placed me in the best tribe among them. That is the meaning of His saying: 'Nations and tribes' [Al-Hujurat: 13] (to the end of) the verse. So I am the most God-fearing of the children of Adam and the most honoured of them before Allah, and this is not (said) out of pride (but as a statement of fact). Then He divided the tribes into households, and placed me in the best household among them." That is the meaning of His saying: "Allah only intends to remove all impurity from you, O people of the household, and to purify you thoroughly" [Al-Ahzab: 33].
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12551