لِکُلِّ شَیْءٍ أسَاسٌ وَأسَاسُ الإِسْلامِ حُبُّنا أهْلَ البَیْتِ Everything has a foundation and the foundation of Islam is loving us, the Prophet's household.
Al-Kafi, vol. 2, page 45
Rasul Allah Hazrat Muhammad (Peace and blessings of Allah be upon him and his progeny)Hadith