Sahih Bukhari Volume 2, Book 16, Hadith 1051

ثُمَّ رَكِبَ رَسُولُ اللَّهِ صلى الله عليه وسلم ذَاتَ غَدَاةٍ مَرْكَبًا، فَخَسَفَتِ الشَّمْسُ، فَرَجَعَ ضُحًى، فَمَرَّ رَسُولُ اللَّهِ صلى الله عليه وسلم بَيْنَ ظَهْرَانَىِ الْحُجَرِ، ثُمَّ قَامَ يُصَلِّي، وَقَامَ النَّاسُ وَرَاءَهُ، فَقَامَ قِيَامًا طَوِيلاً، ثُمَّ رَكَعَ رُكُوعًا طَوِيلاً، ثُمَّ رَفَعَ فَقَامَ قِيَامًا طَوِيلاً، وَهْوَ دُونَ الْقِيَامِ الأَوَّلِ ثُمَّ رَكَعَ رُكُوعًا طَوِيلاً، وَهْوَ دُونَ الرُّكُوعِ الأَوَّلِ، ثُمَّ رَفَعَ فَسَجَدَ، ثُمَّ قَامَ فَقَامَ قِيَامًا طَوِيلاً، وَهْوَ دُونَ الْقِيَامِ الأَوَّلِ، ثُمَّ رَكَعَ رُكُوعًا طَوِيلاً وَهْوَ دُونَ الرُّكُوعِ الأَوَّلِ، ثُمَّ قَامَ قِيَامًا طَوِيلاً وَهْوَ دُونَ الْقِيَامِ الأَوَّلِ، ثُمَّ رَكَعَ رُكُوعًا طَوِيلاً وَهْوَ دُونَ الرُّكُوعِ الأَوَّلِ، ثُمَّ رَفَعَ فَسَجَدَ وَانْصَرَفَ، فَقَالَ مَا شَاءَ اللَّهُ أَنْ يَقُولَ، ثُمَّ أَمَرَهُمْ أَنْ يَتَعَوَّذُوا مِنْ عَذَابِ الْقَبْرِ‏

Then one day, Allah's Apostle rode to go to some place but the sun eclipsed. He returned in the forenoon and passed through the rear of the dwellings (of his wives) and stood for the (eclipse) prayer, and the people stood behind him. He stood up for a long period and then performed a prolonged bowing which was shorter than the first bowing. Then he raised his head and prostrated. Then he stood up (for the second Raka) for a long while but the standing was shorter than that of the first Raka. Then he performed a prolonged bowing which was shorter than the first one. Then he raised his head and prostrated. Then he stood up for a long time but shorter than the first. Then he performed a prolonged bowing but shorter than the first. Then he raised his head and prostrated and finished the prayer and (then delivered the sermon and) said as much as Allah wished. And then he ordered the people to seek refuge with Allah from the punishment of the grave.