Sunan an-Nasa'i

It was narrated from Hudhaifah that: He prayed beside the Prophet (ﷺ) one night. He recited, and when he came to a verse that mentioned punishment, he would pause and seek refuge with Allah; if he came to a verse that mentioned mercy, he would pause for mercy. In his bowing he would say: “Subhana Rabbil-Azim (Glory be to my Lord Almighty)' and in his prostration he would say: “Subhan Rabbil-A'la (Glory be to my Lord the Most High)””