Al-Kāfi
Hadith 21782ـ وَبِهَذَا الإسْنَادِ قَالَ مَنْ بَدَأَ بِالْكَلامِ قَبْلَ السَّلامِ فَلا تُجِيبُوهُ وَقَالَ ابْدَءُوا بِالسَّلامِ قَبْلَ الْكَلامِ فَمَنْ بَدَأَ بِالْكَلامِ قَبْلَ السَّلامِ فَلا تُجِيبُوهُ.
2. Through the same chain of narrators it is narrated from Abu ‘Abdillah (a.s.) who has said the following: “If one begins speaking before offering the greeting of peace, do not speak to him.”