Mishkat al-Masabih #782
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ جَابِرِ بْنِ سَمُرَةَ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقْرَأُ فِي الْفَجْرِ ب (ق وَالْقُرْآن الْمجِيد)
وَنَحْوِهَا وَكَانَتْ صَلَاتُهُ بَعْدُ تَخْفِيفًا. رَوَاهُ مُسْلِمٌ
Jabir b. Samura said that the. Prophet used to recite at the dawn prayer, "Qaf. By the glorious Qur'an"* and a passage of similar length, and his prayer afterwards was shortened.
*Al-Qur’an; 50.
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #782 from Mishkat al-Masabih, in the Book of Prayer.