عثمان بن عيسى عن علي بن سالم * قال: سمعت أبا عبد الله عليه السلام يقول: آية في كتاب الله مسجلة قلت: ما هي؟ قال: قول الله تبارك وتعالى في كتابه: هل جزاء الاحسان الا الاحسان، جرت في الكافر والمؤمن والبر والفاجر من صنع إليه معروف فعليه ان يكافي به وليست المكافاة أن يصنع كما صنع به بل حتى يرى مع فعله لذلك أن له الفضل المبتدأ.
2.ʿUthmān ibn ʿĪsā narrated from ʿAlī ibn Sālim who said, “I heard AbāʿAbdillāh  say, ‘There is a verse in the Qurʾān that is unrestrictedly applicable [to all].’ I asked, ‘Which [verse] is it?’ He said, ‘The verse wherein Allah, the Blessed and Exalted, says: Is there any reward for goodness except goodness? (Q55:60) – it applies to the disbeliever and the believer, to the righteous and the wicked. Whoever is done a good turn, it is incumbent upon him to reciprocate; and reciprocation does not mean doing the same as what was done for him; rather, he must do good to the extent that he sees that by his action, he has attained the merit of the initiator [of goodness].’”