Sahih Bukhari Volume 2, Book 16, Hadith 1067

وَقَالَ الأَوْزَاعِيُّ وَغَيْرُهُ سَمِعْتُ الزُّهْرِيَّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ أَنَّ الشَّمْسَ، خَسَفَتْ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَبَعَثَ مُنَادِيًا بِالصَّلاَةُ جَامِعَةٌ، فَتَقَدَّمَ فَصَلَّى أَرْبَعَ رَكَعَاتٍ فِي رَكْعَتَيْنِ وَأَرْبَعَ سَجَدَاتٍ‏.‏ وَأَخْبَرَنِي عَبْدُ الرَّحْمَنِ بْنُ نَمِرٍ سَمِعَ ابْنَ شِهَابٍ مِثْلَهُ‏.‏ قَالَ الزُّهْرِيُّ فَقُلْتُ مَا صَنَعَ أَخُوكَ ذَلِكَ، عَبْدُ اللَّهِ بْنُ الزُّبَيْرِ مَا صَلَّى إِلاَّ رَكْعَتَيْنِ مِثْلَ الصُّبْحِ إِذْ صَلَّى بِالْمَدِينَةِ‏.‏ قَالَ أَجَلْ، إِنَّهُ أَخْطَأَ السُّنَّةَ‏.‏ تَابَعَهُ سُفْيَانُ بْنُ حُسَيْنٍ وَسُلَيْمَانُ بْنُ كَثِيرٍ عَنِ الزُّهْرِيِّ فِي الْجَهْرِ‏.‏

Al-Auza'i and others said that they had heard Az-Zuhi from 'Ursa from 'Aisha saying, "In the life-time of Allah's Apostle the sun eclipsed, and he made a person to announce: 'Prayer in congregation.' He led the prayer and performed four bowing and four prostrations in two Rakat." Narrated Al-Walid that 'Abdur-Rahman bin Namir had informed him that he had heard the same. Ibn Shihab heard the same. Az-Zuhrl said, "I asked ('Ursa), 'What did your brother 'Abdullah bin AzZubair do? He prayed two Rakat (of the eclipse prayer) like the morning prayer, when he offered the (eclipse) prayer in Median.' 'Ursa replied that he had missed (i.e. did not pray according to) the Prophet's tradition." Sulaiman bin Kathir and Sufyan bin Husain narrated from Az-Zuhri that the prayer for the eclipse used to be offered with loud recitation.