١ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) السَّلامُ تَطَوُّعٌ وَالرَّدُّ فَرِيضَةٌ.
1. Ali ibn Ibrahim has narrated from his father from al-Nawfali from al-Sakuni from Abu ‘Abdillah  who has said the following: “The Messenger of Allah has said, ‘Offering the greeting of peace is voluntary, but answering it is obligatory. ’” 