The Book of the Believer · Hadith 125 (#Ḥadīth #19)
Chapter 5 | The Reward of Helping a Believer, Relieving Him of Distress And Showing Him Kindness
125- أبو حمزة عن أحدهما عليهما السلام: أيما مسلم أقال مسلما ندامة اقاله الله عز وجل عذاب يوم القيامة
125. Abu Hamzah reported that one of the two (al-Baqir or al-Sadiq) said: If any Muslim gives a concession to another Muslim in trade, Allah will grant him an exemption from the chastisement of the Day of Resurrection.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).