Riyad as-Salihin

Abu Malik Al-Ash'ari (may Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said: "Purity is half of iman (faith). ‘Al-hamdu lillah (all praise and gratitude belong to Allah)’ fills the scales, and ‘subhan-Allah (how far is Allah from every imperfection) and ‘Al-hamdulillah (all praise and gratitude belong to Allah)’ fill that which is between heaven and earth."

[Muslim].