ʿUyūn akhbār al-Riḍā
Hadith 165165 - وَبِهذَا الإِسناد عَنْ جَعْفَرِ بْنِ بْنِ مُحَمَّدعَلَيْهِمَاالسَّلاَمُ قالَ: سُئِلَ مُحَمَّدِ بْنِ عَلِىعَلَيْهِمَا السَّلاَمُ عَنِ الصَّلاة فِي السَّفَر، فَذَكَرَ أَن أَباهُ عَلَيْهِ السَّلامُ كانَ يُقَصِّرُ الصَّلاةَ فِي السَّفَرِ.
31-165 According to the same documentation, on the authority of Ja’far ibn Muhammad (a.s.) that Muhammad ibn Ali (a.s.) was questioned about praying on a journey. He (a.s.) replied, “My father (a.s.) shortened his prayers while he (a.s.) was on a journey.”