“Let him who is "without sin" cast the first stone”(This is "without fault" or "without blame" in some versions)
*"Judge not, that you be not judged. For with the judgment you pronounce you will be judged, and the measure you give will be the measure you get.
“Woe to you, scribes and Pharisees, hypocrites! For you are like whitewashed tombs which do indeed appear beautiful outwardly, but inside are full of dead men’s bones and all uncleanliness.”
Source: Bible Dictionary
Edit to add:
The first one is suppose to be the Big One....on forgiveness for doing it,
No one cast a stone that day. 
*My personal favorite.....
Also,
"Judge not lest ye be judged." From my grandmothers (very old) Bible.