´It was narrated that Umayyah bin 'Abdullah bin Khalid bin Asid said to Ibn 'Umar:` "How can the Salah be shortened as Allah says: There is no sin on you if you shorten As-Salah (the prayer) if you are in fear?" [1] Ibn 'Umar said: "O son of my brother! The Messenger of Allah (ﷺ) came to us when we had gone astray and he taught us. One of the things that he taught us was that Allah, the Mighty and Sublime, has commanded us to pray two Rak'ahs when traveling." [1] An-Nisa' 4:101.
Hadith Referenceسنن نسائي / كتاب الصلاة / 458
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده حسن
Hadith Takhrij«سنن ابن ماجہ/إقامة 73 (1066)، مسند احمد 2/94، 148، ویأتي عند المؤلف (برقم: 1435) (صحیح)»
´It was narrated from Umayyah bin 'Abdullah bin Khalid that:` He said to 'Abdullah bin 'Umar: "We find (mention of) prayer when one is at home (i.e., not traveling) and prayer at times of fear in the Qur'an, but we do not find any mention in the Qur'an of prayer when traveling. Ibn Umar said to him: 'O son of my brother, Allah (SWT) send Muhammad (ﷺ) to us when we did not know anything, and all we should do is to do that which we saw Muhammad (ﷺ) doing.'"
Hadith Referenceسنن نسائي / كتاب تقصير الصلاة فى السفر / 1435