BEST ACTIONS H 551 "A man asked the Prophet, praise and peace be upon him, 'What action is best in Islam?' He answered: 'Feeding people and greeting everyone with the greeting of peace whether you know them or not.'" R 551 Bukhari and Muslim with a chain up to Abdullah the son of Amr son of Al 'As who related this.
549- وعن عبد اللهِ بن عمرو بن العاص رضي الله عنهما : أنَّ رَجُلاً سَألَ رسول الله صلى الله عليه وآله وسلم : أيُّ الإسلامِ خَيْرٌ ؟ قَالَ : "تُطْعِمُ الطَّعَامَ ، وَتَقْرَأُ السَّلاَمَ عَلَى مَنْ عَرَفْتَ وَمَنْ لَمْ تَعْرِفْ" متفقٌ عَلَيْهِ .