The Book of the Believer · Hadith 136 (#Ḥadīth #30)
Chapter 5 | The Reward of Helping a Believer, Relieving Him of Distress And Showing Him Kindness
136- وعن أبي جعفر عليه السلام قال: من مشى في حاجة لأخيه المسلم حتى يتمها أثبت الله قدميه يوم تزل الأقدام
136. It has been reported that Abu Ja'far said: One who goes a distance to help his Muslim brother until he completes it, Allah will steady his feet on the Day when feet shall waver and slip.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).