Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.144.

Section : Sunnah acts of prayer, How The Prophet Would Recite the Qur’an.

He would draw out his voice over the long vowels, pause at the end of every verse, and elongate his voice with the recital. This ends the section that has been taken from the writings of Ibn al-Qayyim.