al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
٦٢. وَقَالَ (عليه السلام): إِذَا حُيِّيْتَ بِتَحِيَّةٍ فَحَيِّ بِأَحْسَنَ مِنْهَا، وإِذَا أُسْدِيَتْ إِلَيْكَ يَدٌ فَكَافِئْهَا بِمَا يُرْبِي عَلَيْهَا، وَالْفَضْلُ مَعَ ذلِكَ لِلْبَادِئِ.
62. Amīr al-mu’minīn, peace be upon him, said: If you are met with a greeting, give better greetings in return. If a hand of help is extended to you, do a better favour in return, although the credit would remain with the one who was first.
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