Mishkat al-Masabih #772
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَنَسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَأَبا بكر وَعمر رَضِي الله عَنْهُمَا كَانُوا يَفْتَتِحُونَ الصَّلَاةَ بِ «الْحَمْدُ لِلَّهِ رَبِّ الْعَالمين» )
رَوَاهُ مُسلم
Anas said that the Prophet, Abu Bakr and ‘Umar used to begin the prayer with, “Praise be to God the Lord of the universe.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #772 from Mishkat al-Masabih, in the Book of Prayer.