Prayer: Changing Destination During a Journey
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1275
If a person travels towards a place on a journey of eight farsakhs and after going some distance he decides to go somewhere else, in the event that the distance between the first place from where he started his journey to the place where he wants to go is eight farsakhs, he must perform qaṣr prayers.