Anas bin Malik said about this Ayah:
Their sides forsake their beds (32:16) - "It was revealed about waiting for [this] Salat which you call Al-'Atamah." (RU)
English reference (RU): Vol. 5, Book 44, Hadith 3196 (RU)
Arabic reference (RU): Book 47, Hadith 3500 (RU)