Sunan an-Nasa'i, Book 16, Hadith 20 (In-Book) ⓘ

It was narrated that Jabir bin 'Abdullah said: "The sun eclipsed during the time of the Messenger of Allah on a very hot day. The Messenger of Allah led his companions in prayer, and he stood for so long that they started to fall over. Then he bowed for a long time, then he stood up (and remained standing) for a long time. Then he bowed again for a long time, then he stood up (again) and (remained standing) for a long time. Then he prostrated twice, then he stood up and did the same again. He started to move forward, then he started to step back. He bowed four times and prostrated four times. They used to say that eclipses of the sun and moon only happened when one of their great men died, but they are two of the signs of Allah (SWT) that He shows to you, so when an eclipse happens, pray until it is over."

أَخْبَرَنَا أَبُو دَاوُدَ، قَالَ حَدَّثَنَا أَبُو عَلِيٍّ الْحَنَفِيُّ، قَالَ حَدَّثَنَا هِشَامٌ، صَاحِبُ الدَّسْتَوَائِيِّ عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ كَسَفَتِ الشَّمْسُ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي يَوْمٍ شَدِيدِ الْحَرِّ فَصَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم بِأَصْحَابِهِ فَأَطَالَ الْقِيَامَ حَتَّى جَعَلُوا يَخِرُّونَ ثُمَّ رَكَعَ فَأَطَالَ ثُمَّ رَفَعَ فَأَطَالَ ثُمَّ رَكَعَ فَأَطَالَ ثُمَّ رَفَعَ فَأَطَالَ ثُمَّ سَجَدَ سَجْدَتَيْنِ ثُمَّ قَامَ فَصَنَعَ نَحْوًا مِنْ ذَلِكَ وَجَعَلَ يَتَقَدَّمُ ثُمَّ جَعَلَ يَتَأَخَّرُ فَكَانَتْ أَرْبَعَ رَكَعَاتٍ وَأَرْبَعَ سَجَدَاتٍ كَانُوا يَقُولُونَ إِنَّ الشَّمْسَ وَالْقَمَرَ لاَ يَخْسِفَانِ إِلاَّ لِمَوْتِ عَظِيمٍ مِنْ عُظَمَائِهِمْ وَإِنَّهُمَا آيَتَانِ مِنْ آيَاتِ اللَّهِ يُرِيكُمُوهُمَا فَإِذَا انْخَسَفَتْ فَصَلُّوا حَتَّى تَنْجَلِيَ ‏‏.‏‏