Hadith 7
Abdullah ibn Amr reported: A man asked the Prophet, “Which Islam is best?” The Messenger of Allah, peace and blessings be upon him, said:
تُطْعِمُ الطَّعَامَ وَتَقْرَأُ السَّلاَمَ عَلَى مَنْ عَرَفْتَ وَمَنْ لَمْ تَعْرِفْ
To feed the hungry and to greet with peace those you know and those you do not know.
Source: Ṣaḥīḥ al-Bukhārī 28, Grade: Muttafaqun Alayhi