Al-Kāfi

Hadith 2179
etiquette
3ـ وَبِهَذَا الإسْنَادِ قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) أَوْلَى النَّاسِ بِالله وَبِرَسُولِهِ مَنْ بَدَأَ بِالسَّلامِ.
3. Through the same chain of narrators it is narrated from Abu ‘Abdillah (a.s.) who has said the following: “The Messenger of Allah has said, ‘A person who is closer to Allah and His Messenger is the one who initiates the offering of the greeting of peace.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī