4 chains merged

"When the prayers were first enjoined they were of two rak`at each. Later the prayer in a journey was kept as it was but the prayers for non-travelers were completed." Az-Zuhri said, "I asked `Urwa what made Aisha pray the full prayers (in

"Urwah told me that 'Aishah said: 'Allah enjoined the salah upon the Messenger of Allah (ﷺ), and the first thing that He enjoined was two Rak'ahs at a time, then it was made complete four Rak'ahs while in the state of residence but the pray

“Aishah narrated to me that the Messenger of Allah (ﷺ) prayed Witr with one Rak’ah, then he prayed two Rak’ah in which he recited while sitting, then when he wanted to bow, he stood up and bowed.”

Allah enjoined prayer on the lips of your Prophet (ﷺ), four (rak'ahs) when not travelling, two rak'ahs when travelling, and one rak'ah at times of fear.