Jamieson, Fausset and Brown on Acts 23:3-4

3-4. God shall smite thee--as indeed He did; for he was killed by an assassin during the Jewish war [Josephus, Wars of the Jews, 2.17.9].

thou whited wall--that is, hypocrite (Mt 23:27). This epithet, however correctly describing the man, must not be defended as addressed to a judge, though the remonstrance which follows--"for sittest thou," &c.--ought to have put him to shame.