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When he initiates salam, if you alone are present then it is compulsory for you to respond to him. However if there are multiple people present then it is sufficient for any one of them to respond.


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The hadith you've mentioned can be found in Sahih al-Bukhari (see for example in the book of good manners and forms: al-Adab, in the book of asking permission, in the book of fighting for the cause of Allah (Jihad), in the book of Invocations and in the book of dealing with apostates) and in Sahih Muslim) in several chapters too. Imam al-Bukhari also ...


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