Characteristics of Prayer

Bukhari :: Book 1 :: Volume 12 :: Hadith 710

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)."

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star