Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 1970
'A'isha reported that the Apostle of Allah (may peace be upon him) recited loudly in the eclipse prayer, and he observed four rak'ahs in the form of two rak'ahs and four prostrations. Zuhri said: Kathir b. 'Abbas narrated on the authority of Ibn 'Abbas that the Apostle of Allah (may peace be upon him) observed four rak'ahs and four prostrations in two rak'ahs.