It wasnarrated that Anas bin Malik said:
"The Messenger of Allah(ﷺ),Abu Bakr and 'Umar used to start their recitation with 'All thepraises and thanks are to Allah, the Lord of all that exists(Al-hamduLillahi Rabbil-'Alamin)." [1:2] (IT)
English reference (IT): Vol. 1, Book 5, Hadith 813 (IT)
Arabic reference (IT): Book 5, Hadith 862 (IT)