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 ibnYazid that he saw Umar ibn al-Khattab beating al-Munkadir for prayingafter asr. Translation Not Available

Book Ref: Muwatta Imam Malik Book 15 Hadith 522
Web Ref:  Muwatta Imam Malik Book 15 Hadith 50