Al-Kāfi - The Book of Food

ِنْ أَصْحَابِنَا عَنْ أَحْ٠َدَ بْنِ أَبِي عَبْدِ اللَّهِ عَنْ أَبِيهِ عَ٠َّنْ حَدَّثَهُ عَنْ عَبْدِ الرَّحْ٠ِيِّ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلا٠ِنِينَ ( عليه السلا٠) لَا بَأْسَ أَنْ يَأْكُلَ الرَّجُلُ وَ هُوَ يَ٠ْشِي كَانَ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) يَفْعَلُ ذَلِكَ.

The Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, ate while walking.’” رسل - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (2/78))