ابْنُ مَحْبُوبٍ عَنْ عَبْدِ اللَّهِ بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اللَّهِ ع قَالَ:
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رَدُّ جَوَابِ الْكِتَابِ وَاجِبٌ كَوُجُوبِ رَدِّ السَّلَامِ وَ الْبَادِي بِالسَّلَامِ أَوْلَى بِاللَّهِ وَ رَسُولِهِ.
Read English translationHide English translationMuhammad Sarwar — attributed by Thaqalayn
2. Ibn Mahbub has narrated from ‘Abd Allah ibn Sinan from Abu ‘Abdillah (a.s.) who has said the following: “It is necessary to reply a letter just as it is necessary to answer a greeting of peace. The initiator of a greeting of peace is closer to Allah and His messenger.”
Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.
Hadith gradings
1- صحيحAllamah Baqir al-MajlisiMirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (12/577)