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