Al-Kāfi
Hadith 16912ـ وَعَنْهُ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ أَبِي أَيُّوبَ قَالَ قُلْتُ لأَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) أَدْنَى مَا يَقْصُرُ فِيهِ الْمُسَافِرُ فَقَالَ بَرِيدٌ.
2. It is a narration from him (narrator of previous Hadith) by his father from Ibn Abi ‘Umayr from abu Ayyub who has said the following: “I once asked abu ‘Abd Allah (a.s.), about the minimum distance after the traveling of which a traveler reduces his Salah (prayer). He (the Imam) said, ‘It is one barid.’”