Sunan Abi Dawud 782
سنن أبي داود#782Sahihحَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم وَأَبَا بَكْرٍ وَعُمَرَ وَعُثْمَانَ كَانُوا يَفْتَتِحُونَ الْقِرَاءَةَ بِـ { الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ } .
‘Anas said:The Prophet(peace be upon hm), Abu Bakr, ‘Umar and ‘Uthman used to begin the recitation with “Praise be to Allah, the Lord of the Universe.”
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (743) Sahih Muslim (399)
In-book reference: 2:392