Musnad Abu Ya'la al-Mawsili 209:144

Abu Khaythama narrated to us, Yahya bin Sa'id al-Umawi narrated to us, from Ibn Jurayj, from 'Abdullah bin Abi Mulayka, from Umm Salama, who said: When the Messenger of Allah (peace and blessings of Allah be upon him) recited, he would pause his recitation, verse by verse: "In the name of Allah, the Most Gracious, the Most Merciful," "All praise is due to Allah, Lord of the worlds," "The Master of the Day of Recompense."