Bismillahirrahmanirrahim
Hadith: Khana khilao aur salam karo
Abdullah bin Amr Radhi Allahu Anhu se rivayat hai ki Ek shaksh ne Rasool-Allah Sal-Allahu Alaihi Wasallam se pucha islam mein kaunsi halat (ya baat) afzal hai Rasool-Allah Sal-Allahu Alaihi Wasallam ne farmaya khana khilao aur salam karo use jise tum pahchante ho use bhi aur jise tum nahi pahchante ho use bhi.
Sahih Bukhari, vol 7, 6236
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Narrated ‘Abdullah bin ‘Amr Radhi Allahu Anhu : A man asked the Prophet Sal-Allahu Alaihi Wasallam , “What Islamic traits are the best?” The Prophet Sal-Allahu Alaihi Wasallam said, “Feed the people, and greet those whom you know and those whom you do not know.”
Sahih Bukhari, Vol 8, Book 74, No. 253
Aal-e-Qutub Aal-e-Syed Abdullah Shah Ghazi 