Mishkat al-Masabih #592
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن مَالك بَلَغَهُ أَنَّ عَلِيُّ بْنُ أَبِي طَالِبٍ وَعَبْدُ اللَّهِ بْنُ عَبَّاسٍ كَانَا يَقُولَانِ: الصَّلَاةُ الْوُسْطَى صَلَاة الصُّبْح. رَوَاهُ فِي الْمُوَطَّأ
وَرَوَاهُ التِّرْمِذِيّ عَن ابْن عَبَّاس وَابْن عمر تَعْلِيقا
Malik heard that ‘Ali b. Abu Talib and ‘Abdallah b. ‘Abbas used to say, “The middle prayer is the morning prayer.”
He transmitted it in al-Muwatta’, and Tirmidhi transmitted it from Ibn ‘Abbas and Ibn ‘Umar without a full isnad.
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About Mishkat al-Masabih
This hadith is #592 from Mishkat al-Masabih, in the Book of Prayer.