Hadith #5194 (Sunan Abi Dawud)
Book: General Behavior (Kitab Al-Adab)
Narrator(s): Ishaq bin Ibrahim bin Swyd إسحاق بن إبراهيم بن سويد, Mua'dh bin Anas al-Juhni, Nafi' bin Yazid al-Kula'i نافع بن يزيد الكلاعي, Sa'id bin Abi Maryam سعيد بن أبي مريم, Sahl bin Mua'dh bin Ans سهل بن معاذ بن أنس الجهني
Grade: Sahih

A man asked the Messenger of Allah (May peace be upon him): When aspect of Islam is best? He replied: that you should provide food and greet both those you know and those you do not know.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-5194/