'Wounding' in the Bible

Lamech said to his wives,“Adah and Zillah,Listen to my voice,You wives of Lamech,Give heed to my speech,For I have killed a man for wounding me;And a boy for striking me;

Then he found another man and said, “Please strike me.” And the man struck him, wounding him.

And so, by sinning against the brethren and wounding their conscience when it is weak, you sin against Christ.