Abdullah bin Amr bin As reported,

The sun was eclipsed during the time of the Messenger of Allah ﷺ, so the Messenger of Allah ﷺ stood up. He stood for so long that he almost did not bow, then he bowed. He stayed bowing for so long that he almost did not rise, then he rose. He stayed standing for so long that he almost did not prostrate, then he prostrated. He stayed in prostration for so long that he almost did not rise, then he rose. He stayed sitting for so long that he almost did not prostrate again, then he prostrated. He stayed in prostration for so long that he almost did not rise, then he rose. He did the same in the second cycle.Then at the end of his prostration he blew and said, "Uff, uff." Then he said, "My Lord, did You not promise me that You would not punish them while I am among them? Did You not promise me that You would not punish them while they are seeking forgiveness?"The Messenger of Allah ﷺ finished his prayer, and the sun had cleared. And he continued the hadith.

حدثنا موسى بن إسمعيل حدثنا حماد عن عطاء بن السائب عن أبيه

عن عبد الله بن عمرو قال

انكسفت الشمس على عهد رسول الله ﷺ فقام رسول الله ﷺ فلم يكد يركع ثم ركع فلم يكد يرفع ثم رفع فلم يكد يسجد ثم سجد فلم يكد يرفع ثم رفع فلم يكد يسجد ثم سجد فلم يكد يرفع ثم رفع وفعل في الركعة الأخرى مثل ذلك ثم نفخ في آخر سجوده فقال أف أف ثم قال رب ألم تعدني أن لا تعذبهم وأنا فيهم ألم تعدني أن لا تعذبهم وهم يستغفرون ففرغ رسول الله ﷺ من صلاته وقد أمحصت الشمس وساق الحديث