Musnad Ahmad

It is narrated from Sayyiduna Ibn Amr (may Allah be pleased with him) that during the blessed era of the Noble Prophet (peace and blessings be upon him), there was a solar eclipse. The Noble Prophet (peace and blessings be upon him) stood up for prayer, so we also stood with him. The Noble Prophet (peace and blessings be upon him) stood for such a long time that we began to think that perhaps the Noble Prophet (peace and blessings be upon him) would not bow (ruku). Then he bowed, and while raising his head from ruku, it did not seem as if he would rise. Then when he raised his head from ruku and went into prostration (sajdah), it did not seem as if he would lift his head from prostration. And in the second rak'ah, he did the same, and the sun became bright.