It is narrated from Nafi‘ that when he traveled a distance of one barid with Ibn ‘Umar (may Allah be pleased with them both), he (Ibn ‘Umar) would not shorten the prayer during that journey.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 346
Hadith Takhrijأخرجه البيهقي في معرفة السنن والآثار: 1581 - ومالك في الموطأ: الصلاة، باب ما يجب فيه قصر الصلاة - عبد الرزاق: 4295.