The Prophet ﷺ, Abu Bakr, and Umar, may Allah be pleased with them both, would start their recitation with: "All the praise and thanks be to Allah, the Lord of all that exists.  

كَانَ النَّبِيُّ ﷺ وَأَبُو بَكْرٍ وَعُمَرُ ؓ يَسْتَفْتِحُونَ الْقِرَاءَةَ بِ { الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ }  

"I prayed with the Prophet ﷺ and with Abu Bakr and Umar, may Allah be pleased with them both, and they started with "All the praise and thanks be to Allah, the Lord of all that exists."  

صَلَّيْتُ مَعَ النَّبِيِّ ﷺ وَمَعَ أَبِي بَكْرٍ وَعُمَرَ ؓ فَافْتَتَحُوا بِ { الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ }