أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، عَنِ الأَوْزَاعِيِّ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ خَسَفَتِ الشَّمْسُ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَنُودِيَ الصَّلاَةُ جَامِعَةٌ فَاجْتَمَعَ النَّاسُ فَصَلَّى بِهِمْ رَسُولُ اللَّهِ صلى الله عليه وسلم أَرْبَعَ رَكَعَاتٍ فِي رَكْعَتَيْنِ وَأَرْبَعَ سَجَدَاتٍ ‏‏.‏‏

It was narrated from Az-Zuhri, from 'Urwah, that : Aishah said: "The sun was eclipsed during the lifetime of the Messenger of Allah (PBUH) and it was called out: 'As-salatu jam'iah (prayer is about to begin in congregation).' So the people gathered and the Messenger of Allah (PBUH) led them in prayer, bowing four times in two rak'ahs and prostrating four times." Translation Not Available

Book Ref: Sunan An Nisai Book 16 Hadith 1473
Web Ref:  Sunan An Nisai Vol 2 Book 16 Hadith 1474