Ibn 'Umar reported that the Messenger of Allah (ﷺ), Abu Bakr and 'Umar used to observe the two 'Id prayers before the sermon. (ES)
Reference (ES): Sahih Muslim 888 (ES)
In-book reference (ES): Book 8, Hadith 8 (ES)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1930 (ES)