Muwatta Imam Malik Book of Prayer in Congregation, Hadith 29

Yahya related to me from Malik that he had heard that AIi ibn Abi Talib and Abdullah ibn Abbas used to say, "The middle prayer is the prayer of subh."
Malik said, "Out of all that I have heard about the matter, I prefer what Ali ibn Abi Talib and Abdullah ibn Abbas said."

وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَلِيَّ بْنَ أَبِي طَالِبٍ، وَعَبْدَ اللَّهِ بْنَ عَبَّاسٍ، كَانَا يَقُولاَنِ الصَّلاَةُ الْوُسْطَى صَلاَةُ الصُّبْحِ . قَالَ مَالِكٌ وَقَوْلُ عَلِيٍّ وَابْنِ عَبَّاسٍ أَحَبُّ مَا سَمِعْتُ إِلَىَّ فِي ذَلِكَ .