His regular practice—may Allah bless him and grant him peace—of performing the ʿEid prayer in the open-air musalla, and the hadiths that confirm this

More than one of the leading hadith masters have stated that “the Prophet’s ﷺ established practice for the two ʿEids was always to pray them in the musalla.”1

Numerous reports in the two Ṣaḥīḥs, the Sunan, the Musnad collections, and other works, transmitted through a great many chains, corroborate this. It is therefore fitting, even in this brief treatise, to cite a selection of these narrations so that the discerning reader may recognize the soundness of what I have asserted. I proceed, then, to mention them:

Hadith 1
Abū Saʿīd al-Khudrī (may Allah be pleased with him) said: “The Messenger of Allah ﷺ used to go out on the Day of Fitr …”