Al-Adab Al-Mufrad, Book 42, Hadith 30 (In-Book) ⓘ
Jabir said, "When two people walking meet, then the one who gives the greeting first is the better of them."
قَالَ ابْنُ جُرَيْجٍ: فَأَخْبَرَنِي أَبُو الزُّبَيْرِ، أَنَّهُ سَمِعَ جَابِرًا يَقُولُ: الْمَاشِيَانِ إِذَا اجْتَمَعَا فَأَيُّهُمَا بَدَأَ بِالسَّلاَمِ فَهُوَ أَفْضَلُ.
also referenced under: Hadith 994 (Reference) & Book 42, Hadith 994 (English)