Usamah bin Zaid said: “I asked Tawus about performing voluntary prayer while traveling. Al-Hasan bin Muslim bin Yannaq was sitting with him and he said: ‘Tawus told me that he heard Ibn ‘Abbas say: “The Messenger of Allah (ﷺ) enjoined prayer while a resident and prayer when one is traveling. We used to pray when we were residents both before and after (the obligatory prayer), and we used to pray both before and after (the obligatory prayer) when we were traveling.’”

It was narrated that Ibn ‘Abbas said: “Allah enjoined the prayer upon the tongue of your Prophet (ﷺ): Four Rak’ah while a resident and two Rak’ah when traveling.”

It was narrated that Ibn ‘Abbas said: “The Messenger of Allah (ﷺ) stayed for nineteen days in which he shortened his prayer to two Rak’ah. So, whenever we stayed for nineteen days we would shorten our prayer to two Rak’ah, but if we stayed more than that we would pray four Rak’ah.”

It was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) stayed in Makkah for fifteen nights during the year of the Conquest, (during which time) he shortened his prayer.