Hadith.920 - "The Messenger of Allah صلى الله عليه وعلى آله وسلم was the most complete in performing prayer and the most concise.
When he began his prayer, he would say: 'Allāhu Akbar (God is the Greatest)' and then recite, 'Bismillāh al-Raḥmān al-Raḥīm (In the name of Allah سبحانه وتعالى, the Most Gracious, the Most Merciful).'"