'Overreach' in the Bible

And if ye sell ought unto your neighbour, or buy of your neighbour's hand, ye shall not overreach one another.

I urged Titus to go, and I sent the brother with him. Titus did not take advantage of you, did he? [No!] Did we not conduct ourselves in the same spirit and walk in the same steps? [Of course!]

and that [in this matter of sexual misconduct] no man shall transgress and defraud his brother because the Lord is the avenger in all these things, just as we have told you before and solemnly warned you.