A man asked the Messenger of Allah ﷺ, "Messenger of Allah, which aspect of Islam is best?"He replied, "That you feed others and that you offer the greeting of peace to those you know and those you do not know."
حدثنا محمد بن رمح أنبأنا الليث بن سعد عن يزيد بن أبي حبيب عن أبي الخير
أن رجلا سأل رسول الله ﷺ فقال يا رسول الله أي الإسلام خير قال تطعم الطعام وتقرأ السلام على من عرفت ومن لم تعرف
Bukhari, Faith, chapter, Feeding others is part of Islam, hadith 12, and 28, and elsewhere, from the hadith of Layth, through this route, and Muslim, Faith, chapter, Explanation of the varying degrees of Islam and which of its aspects is most excellent, hadith 39, from Ibn Rumh, through this route.