Sahih Bukhari Volume 002, Book 020, Hadith Number 220.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 20. Shortening The Prayers (At-Taqseer)
Narated By 'Aisha : (The mother of the faithful believers) Allah's Apostle (in his last days) used to pray sitting. He would recite while sitting, and when thirty or forty verses remained from the recitation he would get up and recite them while standing and then he would bow and prostrate. He used to do the same in the second Raka. After finishing the Prayer he used to look at me and if I was awake he would talk to me and if I was asleep, he would lie down.