I have memorized for you that the Messenger of Allah ﷺ performed ablution in the mosque.
حدثنا وكيع عن أبي خالد عن أبي العالية
حفظت لك أن رسول الله ﷺ توضأ في المسجد
No references are available.
Its isnad is sahih. Abu Khaldah is Khalid bin Dinar Tamimi Saadi, deemed reliable, whose hadith appears in Bukhari. Abu Aliyah Riyahi is Rafi bin Mihran. Ahmad alone transmitted this hadith with this wording, though its meaning has occurred many times before.