Muwatta Malik 484
موطأ مالك#484SahihThese are the words of a Companion, not of the Prophet ﷺ. The chain is graded on its own terms.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنِ الأَعْرَجِ، . أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَرَأَ بِالنَّجْمِ إِذَا هَوَى فَسَجَدَ فِيهَا ثُمَّ قَامَ فَقَرَأَ بِسُورَةٍ أُخْرَى .
Yahya related to me from Malik from Ibn Shihab from al-Araj that Umar ibn al Khattab recited Surat an-Najm (Sura 53) and prostrated in it, and then got up and recited another sura
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:
Salim al-HilaliMauquf Sahih
In-book reference: 15:15