Sahih Muslim Book - 4, Hadith - 892

حَدَّثَنَا مُحَمَّدُ بْنُ مِهْرَانَ الرَّازِيُّ حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ حَدَّثَنَا الْأَوْزَاعِيُّ عَنْ عَبْدَةَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ كَانَ يَجْهَرُ بِهَؤُلَاءِ الْكَلِمَاتِ يَقُولُ سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ تَبَارَكَ اسْمُكَ وَتَعَالَى جَدُّكَ وَلَا إِلَهَ غَيْرُكَ .وَعَنْ قَتَادَةَ أَنَّهُ كَتَبَ إِلَيْهِ يُخْبِرُهُ عَنْ أَنَسِ بْنِ مَالِكٍ أَنَّهُ حَدَّثَهُ قَالَ صَلَّيْتُ خَلْفَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَأَبِي بَكْرٍ وَعُمَرَ وَعُثْمَانَ فَكَانُوا يَسْتَفْتِحُونَ بِ { الْحَمْد لِلَّهِ رَبِّ الْعَالَمِينَ } لَا يَذْكُرُونَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ فِي أَوَّلِ قِرَاءَةٍ وَلَا فِي آخِرِهَا.

It was narrated from Al-Awza'i, from 'Abdah; that 'Umar bin Al-Khattab used to recite these words out loud: "Subhanak Allahumma! Wa bi-hamdik, wa tabarakasmuk, wa ta'ala jadduk, wa Ia ilaha ghairuk. (Glory and praise be to You, O Allah! Blessed be Your Name, and exalted be Your Majesty, and there is no God but You." And, from Qatadah, that he wrote to him, informing him, that Anas bin Malik had narrated to him: "I prayed behind the Prophet (s.a.w), Abu Bakr, 'Umar and 'Uthman. They used to start their recitation with: 'Al-hamdu Lillahi Rabbil-'Alamin (All the praises and thanks be to Allah, the Lord of the 'Alamin (mankind, jinn and all that exists)),' and they did not say, 'Bismillahir-Rahmanir-Rahim at the beginning of their recitation, nor at the end."'