Sahih Muslim Book 4, Hadith Number 1981.

Chapter : Mention of the torment of grave in eclipse prayer.

Asma’ daughter of Abu Bakr reported: The sun eclipsed during the lifetime of the Apostle of Allah (may peace be upon him); so he felt perturbed and he, by mistake, took hold of the outer garment of a woman till he was given his own cloak. After this I satisfied my need and then came and entered the mosque. I saw the Messenger of Allah (may peace be upon him) standing in prayer. I stood along with him. He prolonged his qiyam till I wished to sit down. Then I cast a glance towards an old woman. So I said: She is older than I, therefore, kept standing. He (the Holy Prophet) then observed ruku’, and prolonged his ruku’. He then raised his head. He then prolonged his qiyam to such an extent that if a person happened to come he would have thought that he had not observed the ruku’.