صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
فصل في قيام الليل - ذكر الاقتصار للتهجد على قراءة قل هو الله أحد إذ هو ثلث القرآن إذا كان عاجزا عن قراءة ما هو أكثر منه
Section on night prayer – mentioning that reciting “Say: He is Allah, One” suffices for night prayer if unable to do more, as it is a third of the Qur’an
1 hadith
Hadith 2576
Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates this statement of the Prophet (peace and blessings of Allah be upon him): "Is any one of you incapable of reciting one third of the Qur'an every night?" We said: "O Messenger of Allah (peace and blessings of Allah be upon him), who among us can do that?" The Prophet (peace and blessings of Allah be upon him) said: "Reciting Surah Ikhlas is equal to reciting one third of the Qur'an."