Hadith 4

Muwatta Malik

Book 10: The Two 'Ids
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ أَبَا بَكْرٍ، وَعُمَرَ، كَانَا يَفْعَلاَنِ ذَلِكَ ‏.‏
Yahya related to me from Malik that he had heard that Abu Bakr and Umar used to do that.