مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 636
Prayer
The Virtues of Prayer - Section 3
عَن زيد بن ثَابت وَعَائِشَة قَالَا: الصَّلَاةُ الْوُسْطَى صَلَاةُ الظُّهْرِ رَوَاهُ مَالِكٌ عَن زيد وَالتِّرْمِذِيّ عَنْهُمَا تَعْلِيقا
Zaid b. Thabit and ‘A’isha said that the middle prayer is the noon prayer. Malik transmitted it from Zaid and Tirmidhi from both of them without a full isnad.
Mishkat al-Masabih, 636حسن (الألباني)