From Sahih Muslim (Hadith 2113):
Amr b. al-'As reported:When the sun eclipsed during the lifetime of the Messenger of Allah (ﷺ), they (the people) were called to congregational prayers. The Messenger of Allah (ﷺ) observed two ruku's in one rak'ah. He then stood and observed two ruku's in (the second) rak'ah. The sun then became bright, and 'A'isha said; Never did I observe, ruku' and prostration longer than this (ruku' and prostration)
Reference: Muslim 2113