Hazrat Aisha (may Allah be pleased with her) narrates that initially only two rak'ahs of prayer were made obligatory, then they were increased and for a resident four rak'ahs were prescribed.

Hazrat Ibn Umar (may Allah be pleased with both of them) says that in travel, two rak‘ahs are complete; there is no reduction in them.

Hazrat Ali (may Allah be pleased with him) bin Rabee’ah narrates that Hazrat Ali (may Allah be pleased with him) set out on a journey, and until he returned, he continued to perform two rak’ahs (for each prayer).

Hazrat Abu Harb bin Abi Aswad narrates that Hazrat Ali (may Allah be pleased with him) departed from Basra and performed four rak'ahs, and then said: When we cross this hut, we will perform two rak'ahs.

Hazrat Abdur Rahman bin Harmalah says that a man asked Hazrat Saeed bin Musayyib whether he could perform the full prayer and keep fast while traveling. He replied, "No." The man said, "I have the strength to do so." He replied, "The Holy Prophet (peace and blessings be upon him) was stronger than you. During travel, he would shorten the prayer and would not keep fast. And the Messenger of Allah (peace and blessings be upon him) said that the best among you is the one who shortens the prayer and does not keep fast while traveling."

Hazrat Abu Ishaq says that I met Hazrat Abdullah bin Ma’qil in Mada’in and I asked him,“I am the imam of my people and I want to return to my home. How many rak’ahs should I lead in prayer?”He replied,“Four.”Later, I met him in Rayy and I said,“I am the imam of my people and I want to return to my home. How many rak’ahs do you instruct me to pray?”He replied,“Two.”

Hazrat Ibn Tawoos narrates that my father used to perform Qasr prayer from the time he left the house until he returned.

Hazrat Mujahid says that a man came to Hazrat Abdullah bin Abbas (may Allah be pleased with them) and said that he and his friend were both on a journey; he (the man) used to perform the full prayer and his friend used to shorten it. Hazrat Abdullah bin Abbas (may Allah be pleased with them) said, "You were the one shortening the prayer and your friend was performing the full prayer."

Hazrat Abu Nadrah narrates that Hazrat Imran bin Husain passed by our gathering, so a young man stood up and said to him, "Please tell us how the Messenger of Allah (peace and blessings be upon him) used to perform prayer during Hajj, Jihad, and Umrah?" He came and stood among us and said, "He has asked me about something which I want to tell you all as well. I participated in Jihad with the Noble Prophet (peace and blessings be upon him). Until we returned to Madinah, he used to perform two rak‘ahs. I performed Hajj with him, and until we returned to Madinah, he used to perform two rak‘ahs. I stayed with the Noble Prophet (peace and blessings be upon him) in Makkah in the year of the conquest of Makkah; he stayed there for eighteen nights. During that time, he led us in two rak‘ahs of prayer and then, after the salam, he would say to the people of Makkah, 'Complete your four rak‘ahs, for we are travelers.' I performed Hajj and Jihad with Hazrat Abu Bakr; until we returned to Madinah, he would perform only two rak‘ahs. I performed Hajj several times with Hazrat Umar; until we returned to Madinah, he would perform only two rak‘ahs. I performed Hajj for seven years during the leadership of Hazrat Uthman; he too would perform only two rak‘ahs. Then, in Mina, he performed four rak‘ahs."

Hazrat Abu Juhaifa narrates that the Holy Prophet (peace and blessings be upon him) offered two rak'ahs of Zuhr prayer in Makkah according to the prayer of a traveler.