The Book of the Believer · Hadith 135 (#Ḥadīth #29)

135- عن محمد بن مروان عن أحدهما عليهما السلام قال: مشي الرجل في حاجة أخيه المسلم تكتب له عشر حسنات، وتمحى عنه عشر سيئات، ويرفع له عشر درجات ويعدل عشر رقاب، وأفضل من اعتكاف شهر في المسجد الحرام و صيامه

135. It has been reported that Muhammad ibn Marwan said that one of the two (al-Baqir or al-Sadiq) had said: If a person goes a distance to help his Muslim brother, ten good deeds are written for him, ten misdeeds are erased from him, he is elevated ten degrees, and it is equal in reward to freeing ten slaves. In addition, it is better than performing i'tikaf in the Sacred Mosque whilst fasting.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).