[Machine] He passed by a man whose appearance was that of a Muslim, so he greeted him and he responded, "And upon you and the mercy of Allah and His blessings." The boy said to him, "Do you know whom you responded to?" He replied, "Is he not a Muslim man?" They said, "No, but he is a Christian." Uqbah stood up and followed him until he caught up with him and said, "Indeed, the mercy of Allah and His blessings are upon the believers, but may Allah prolong your life and increase your wealth." And we have narrated from Ibn Umar the meaning of initiation with a greeting.  

أَنَّهُ مَرَّ بِرَجُلٍ هَيْئَتُهُ هَيْئَةُ رَجُلٍ مُسْلِمٍ فَسَلَّمَ فَرَدَّ عَلَيْهِ عُقْبَةُ وَعَلَيْكَ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ فَقَالَ لَهُ الْغُلَامُ أَتَدْرِي عَلَى مَنْ رَدَدْتَ؟ فَقَالَ أَلَيْسَ بِرَجُلٍ مُسْلِمٍ؟ فَقَالُوا لَا وَلَكِنَّهُ نَصْرَانِيٌّ فَقَامَ عُقْبَةُ فَتَبِعَهُ حَتَّى أَدْرَكَهُ فَقَالَ إِنَّ رَحْمَةَ اللهِ وَبَرَكَاتِهِ عَلَى الْمُؤْمِنِينَ لَكِنْ أَطَالَ اللهُ حَيَاتَكَ وَأَكْثَرَ مَالَكَ وَرُوِّينَا عَنِ ابْنِ عُمَرَ مَعْنَاهُ فِي الِابْتِدَاءِ بِالسَّلَامِ