Jabir bin Samura reported,

The Prophet ﷺ used to recite "Qaf. By the glorious Quran" [Qaf 50:1] in the dawn prayer, and his prayers afterward were lighter.

Azami 13374

Sahih

عن جابر بن سمرة قال

إن النبي ﷺ كان يقرأ في الفجر {ق والقرءان المجيد} وكان صلاته بعد تخفيفا.

الأعظمي 13374صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Tafsir of the great Quran
Chapter
Tafsir of Surah Qaf
Section
His saying, "They consider it a favor to you that they have accepted Islam. Say, do not consider your Islam a favor to me. Rather, Allah confers favor upon you that He has guided you to faith, if you should be truthful"
Numbering
Jami al-Kamil 13374 (2nd edition)
Azami 13374