It is narrated from Sa'd bin Abi Waqas that when this verse was revealed (‘Come! Let us call our sons and your sons’) [1], the Messenger of Allah (ص) called Ali, Fatimah, Hasan and Husain, and then said:
"O Allah! These are my household." [2]
[1] Sura Ale-Imran, verse 61
[2] Muslim Naishabouri, Sahih, V.7, page 120-121; Tirmidhi, Jam'i as-Sahih V.4, page 293; Ahmad ibn Hanbal, Musnad, V.1, page 185; Hakim Naishapuri, Al-Mustadrak, V.3, page 150; Baihaqi, Sunan-e-Kubra, V.7, page 63; Suyuti, Al-Durr al-Manthur, V.2, page 39; Ibn Asaker, Tarikh Madinah-Damishq, V.42, page 112.
This hadith is among the repeatedly stated traditions.