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Umm Salama said: "The Prophet (Allah bless him and give him peace) used to interrupt his Qur’anic recitation. He would say: “Praise be to Allah, the Lord of all the worlds , then he would pause, then he would say: “The All-Merciful, the All-Compassionate ,” then he would pause and recite: “Master of the Day of Reckoning .”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ: حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ الأُمَوِيُّ، عَنِ ابْنِ جُرَيْجٍ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، عَنْ أُمِّ سَلَمَةَ، قَالَتْ: كَانَ النَّبِيُّ صلى الله عليه وسلم، يَقْطَعُ قِرَاءَتَهُ، يَقُولُ: الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ ثُمَّ يَقِفُ، ثُمَّ يَقُولُ: الرَّحْمَنِ الرَّحِيمِ ثُمَّ يَقِفُ، وَكَانَ يَقْرَأُ مَلِكِ يَوْمِ الدِّينِ.
sunnah.com