Muwatta Malik 159
موطأ مالك#159SahihThese are the words of a Successor — the generation after the Companions — not of the Prophet ﷺ.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ كَانَ يَقُولُ مَنْ صَلَّى بِأَرْضِ فَلاَةٍ صَلَّى عَنْ يَمِينِهِ مَلَكٌ وَعَنْ شِمَالِهِ مَلَكٌ فَإِذَا أَذَّنَ وَأَقَامَ الصَّلاَةَ أَوْ أَقَامَ صَلَّى وَرَاءَهُ مِنَ الْمَلاَئِكَةِ أَمْثَالُ الْجِبَالِ .
Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab used to say, "Whoever prays on waterless, desolate land - an angel prays on his right and an angel prays on his left. When he calls both the adhan and the iqama for the prayer, or calls out the iqama, angels like mountains pray behind him
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 3:14