Which act in Islam is the best

Abdullah bin `Amr bin Al-`as (RadhiAllahu 'anhuma) reported:

A man asked the Messenger of Allah (Sallallaahu 'alaihi wasallam): "Which act in Islam is the best?''

He (Sallallaahu 'alaihi wasallam) replied, "To give food, and to greet everyone, whether you know or you do not.''

[Al-Bukhari and Muslim]

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