The Sufficient (Vol 5) · Hadith 459 (#Ḥadīth #1)

1- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ هِشَامِ بْنِ سَالِمٍ عَنْ أَبِي عَبْدِ اللهِ قَالَ دِرْهَمٌ رِبًا أَشَدُّ مِنْ سَبْعِينَ زَنْيَةً كُلُّهَا بِذَاتِ مَحْرَمٍ.

1. A number of our people have narrated from Ahmad ibn Muhammad ibn ‘Isa from Ibn Abi ‘Umayr from Hisham ibn Salim that Abu ‘Abdillah (al-Sadiq) said, “The sin of receiving one dirham of [unlawful] interest is more serious than having seventy carnal relations with one’s mahrams."

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