Volume 2, Book 20, Number 220:
Narrated ‘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.
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SAHIH BUKHARI VOLUME 2 > BOOK 21: PRAYER AT NIGHT (TAHAJJUD)
Book 21: Prayer at Night (Tahajjud)