Proverbs states it this way:
He that walketh with wise men shall be wise: but a companion of fools shall be destroyed.
Aesop relates it this way:
You Are Known by
the Company You Keep
A man is known by the company he keeps.
Another way of saying it:
You are known by the company you keep.
The Ass and His Purchaser(You might prefer to call this The Donkey and His Purchaser.)
A man wished to purchase an Ass (a Donkey), and decided to give the animal a test before buying him. He took the Ass home and put him in the field with his other Asses.
The new Ass strayed from the others to join the one that was the laziest and the biggest eater of them all.
Seeing this, the man led him back to his owner. When the owner asked how he could have tested the Ass in such a short time, the man answered, "I didn't even need to see how he worked. I knew he would be just like the one he chose to be his friend."
Then again, another saying I've always believed (at least before photo-shopping became so good) is that "A picture is worth a thousand words"..
So when I see that the Community Organizer currently occupying the Oval Office sits down with the likes of Al (Twana Brawley huckster) Sharpton and NY Mayor Bill (Sandinista supporter) de Blasio to find national solutions to strife between inner cities and municipal police departments........... I relate back to Proverbs 13-20 and my friend Aesop and his Ass fable.