Sayyiduna Salman (al-Farisi) (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "I have named the two of them - meaning al-Hasan and al-Husayn - after the names of the two sons of Harun (peace be upon him), Shabbar and Shubayr."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2765