كتاب العيدين
10  
The Two 'Ids

Yahya related to me from Malik that he had heard that Abu Bakr and Umar used to do that.

وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ أَبَا بَكْرٍ، وَعُمَرَ، كَانَا يَفْعَلاَنِ ذَلِكَ ‏.‏
USC-MSA web (English) reference : Book 10, Hadith 4
Arabic reference : Book 10, Hadith 434