Volume 2, Book 20, Number 194:
Narrated Abu Huraira:
The Prophet (p.b.u.h) said, "It is not permissible for a woman who believes in Allah and the Last Day to travel for one day and night except with a Mahram."
"When the prayers were first enjoined they were of two Rakat each. Later the prayer in a journey was kept as it was but the prayers for non-travellers were completed." Az-Zuhri said, "I asked 'Urwa what made Aisha pray the full prayers (in journey)." He replied, "She did the same as 'Uthman did."
Allah's Apostle prayed in his house while sitting during his illness and the people prayed behind him standing and he pointed to them to sit down. When he had finished the prayer, he said, "The Imam is to be followed and so when he bows you should bow; and when he lifts his head you should also do the same."
(the mother of the faithful believers) I never saw Allah's Apostle offering the night prayer while sitting except in his old age and then he used to recite while sitting and whenever he wanted to bow he would get up and recite thirty or forty verses (while standing) and then bow.
(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.