وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، وَعُثْمَانَ بْنَ عَفَّانَ، - رضى الله عنهما - كَانَا يَفْعَلاَنِ ذَلِكَ ‏.‏

Yahya related to me from Malik from Ibn Shihab from Said ihn al-Musayyab that Umar ibn al Khattab and Uthman ibn Affan, may Allah be pleased with them, used to do the same. Translation Not Available

Book Ref: Muwatta Imam Malik Book 9 Hadith 422
Web Ref:  Muwatta Imam Malik Book 9 Hadith 90