It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he said: We were praying the Isha prayer with the Messenger of Allah (peace and blessings be upon him). Whenever he (peace and blessings be upon him) prostrated, Hasan and Husayn (may Allah be pleased with them both) would climb onto his back, and when he (peace and blessings be upon him) raised his head, he would take hold of them very gently and set them down. When he (peace and blessings be upon him) went into prostration again, they too would come back onto his back. When he (peace and blessings be upon him) finished the prayer, he seated one on one side of him and the other on the other side. I came forward and said: O Messenger of Allah (peace and blessings be upon him), shall I take them back to their mother? He (peace and blessings be upon him) said: "No." Just then lightning flashed, and he (peace and blessings be upon him) said: "Go to your mother." So they both kept walking in the light of that lightning until they entered the house. This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.