Guide to Considering Eighty Kilometers as a Traveling Distance

Question:
May Allah reward you. This questioner, Abu Salih from al-Qway'iyah, says: What is the evidence that eighty kilometers is considered traveling, given that the Messenger (peace and blessings be upon him) shortened the prayer in less than five kilometers?

Answer:
The evidence is his saying (peace and blessings be upon him): a journey of two days, unless she has a mahram (a relative one may not marry) with her. The journey of two days is eighty kilometers, because the mount covers forty kilometers in a day, which is one stage, and forty on the second day, the second stage, making the total eighty kilometers. This is the evidence for the estimation. As for your statement that the Messenger (peace and blessings be upon him) shortened the prayer in five kilometers, what is your evidence for this? Show us your evidence for this. Yes.