Imam al-Aazam Abu Hanifa gave one of the pithiest definitions of Sunnism in Islam: "The doctrine of Ahl al-Sunna wal-Jama'a consists in preferring the Two Shaykhs (tafdil al-shaykhayn) [i.e. Abu Bakr and 'Umar over the rest], loving the Two Sons-in-law (hubb al-khatanayn) [i.e. 'Ali and 'Uthman], and [deeming lawful the] wiping on leather socks [in ablution] (al-mas-h 'alal-khuffayn) [i.e. all three contrary to Shi'is]." [Khulasat al-Fatawa, Vol. 2, Page 381]