The Verse of Purification implies that it is the will of Allah to purify none but the Ahl al-Bayt as free of any kind of sin, error, and defilement. Abundant traditions in Shia and Sunni hadith state that, by the term "Ahl al-Bayt", the Five Pure People—or the Ahl al-Kisa, not including the prophets' wives—are meant. Shia interpretation of the Verse of Purification is based on the Hadith of "Ahl al-Kisa’", which is an account of the Prophet gathering his four family members under his cloak. This is in accordance with scholars such as Wilferd Madelung, Momen, and Kardan, who claim that the Verse of Purification is proof of the purification of the Ahl al-Bayt.