al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
١٥٥. وَقَالَ (عليه السلام): اعْتَصِمُوا بِالذِّمَمِ فِي أَوْتَادِهَا.
155. Amīr al-mu’minīn, peace be upon him, said: Adhere to contracts and entrust their fulfilment to steadfast persons.
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