[Machine] The Messenger of Allah ﷺ , Abu Bakr, Umar, and Uthman used to start the recitation after the takbeer with "Alhamdulillahi Rabbil 'Alameen" [Surah Al-Fatiha Verse 2] in the prayer. A'ffan, meaning in prayer after the takbeer.
أَنَّ رَسُولَ اللهِ ﷺ وَأَبَا بَكْرٍ وَعُمَرَ وَعُثْمَانَ كَانُوا يَسْتَفْتِحُونَ الْقِرَاءَةَ بَعْدَ التَّكْبِيرِ بِ {الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ} [الفاتحة 2] فِي الصَّلَاةِ قَالَ عَفَّانُ يَعْنِي فِي الصَّلَاةِ بَعْدَ التَّكْبِيرِ