The one who is like wine is he who helps you satisfy your pleasures and gratify your desires, but he corrupts your moral character and incurs loss on you in the Hereafter.

Finally, the companion who is like a calamity is he who does not benefit you with regard to your worldly life or religion, nor do you enjoy his companionship or conversation, but you inevitably have to keep his company.

You should take religion as a standard, and the pleasure of Allah as a scale. The one who benefits you with regard to your religion, hold on to him, unless you cannot endure his companionship. The one who harms you in this regard, cut him off and forsake him, unless you are compelled to keep his company. In this case, such companionship is considered a necessity, and necessities overrule prohibitions (i.e. permit what is normally forbidden), provided that such company does not exceed the scope of necessity.

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