Thus, its interpretation is that shortening becomes obligatory upon him after he has travelled eight farsakhs, and this continues until he returns to his home. This is because he has now become a traveller, even though he did not intend that distance from the beginning. The first narration only establishes the obligation of praying in full during the period in which he was travelling the mentioned distance before reaching that limit. Therefore, the two reports are not contradictory in this respect. So if a person sets out on a journey, travels two farsakhs and shortens his prayer, but then abandons his original intention, then if he had already shortened the prayer, he must repeat it. What indicates this is what he narrated (in the following hadith):
Commentary #11