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Narrated Anas bin Malik:

The Prophet, Abu Bakr and 'Umar used to start the prayer with "Al-hamdu lil-lahi Rabbil-'ala-min (All praises are for Allah the Lord of the Worlds)."
حَدَّثَنَا حَفْصُ بْنُ عُمَرَ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم وَأَبَا بَكْرٍ وَعُمَرَ ـ رضى الله عنهما ـ كَانُوا يَفْتَتِحُونَ الصَّلاَةَ بِ ـ ‏{‏الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ‏}‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 743
• Sahih al-Bukhari, Vol. 1, Book of Characteristics of Prayer, Hadith 710
• Sahih al-Bukhari, Book of Characteristics of Prayer, Hadith 710