Muwatta Malik · Hadith 519

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنِ السَّائِبِ بْنِ يَزِيدَ، أَنَّهُ رَأَى عُمَرَ بْنَ الْخَطَّابِ يَضْرِبُ الْمُنْكَدِرَ فِي الصَّلاَةِ بَعْدَ الْعَصْرِ ‏.‏

Yahya related to me from Malik from Ibn Shihab from as-Sa'ib ibn Yazid that he saw Umar ibn al-Khattab beating al-Munkadir for praying after asr

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).