Sayyidah Umm Salamah (may Allah be pleased with her) narrated that the Prophet (peace and blessings be upon him) used to recite "Bismillahir-Rahmanir-Rahim" (In the name of Allah, the Most Gracious, the Most Merciful), "Al-hamdu lillahi Rabbil-'alamin" (All praise is for Allah, the Lord of all the worlds) [Al-Fatihah: 2] slowly and deliberately, pronouncing each word separately.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20239