Who was the Prophet Muhammad(SAW) best friend?

And is it permissible to say ill of someone who is not only the best sahaba but also is the best friend of the Prophet Muhammad(SAW)
Update: Wazeer- bro I meant on Earth!
Update 2: PEdram- You rotten Raafidee, may you be held accountable for the intentional misinterpretation of the Quran which you have done.
Update 3: Elda- Hi, I dont argue with retarded old lonely grandmas. Go play with your grandchildren and leave YA
Update 4: No its not that, all u do is yell cuz u no ur religion is full of crap
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