"Whoever says 'lā ilāha illa Allah (there is no god but Allah)' and disbelieves in everything worshiped besides Allah, his property and blood becomes inviolable, and his reckoning will be with Allah."
Abu Mālik al-Ashja‘i Sa‘d ibn Tāriq (may Allah be pleased with him) reported: I said to my father: "O father, you prayed behind the Messenger of Allah (may Allah's peace and blessings be upon him) Abu Bakr, ‘Umar, ‘Uthmān, and ‘Ali here in Kufah for about five years. Did they use to recite the…
صَلَّيْتَ خَلْفَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ وَأَبِي بَكْرٍ وَعُمَرَ وَعُثْمَانَ وَعَلِيٍّ هَا هُنَا بِالْكُوفَةِ، نَحْوًا مِنْ خَمْسِ سِنِينَ. فَكَانُوا يَقْنُتُونَ فِي الْفَجْرِ؟