1 Corinthians 8:12 in the King James Version
But when ye sin so against the brethren, and wound their weak conscience, ye sin against Christ.
Context
11 And through your knowledge, he who is weak perishes, the brother for whose sake Christ died.
12 Thus, sinning against the brothers, and wounding their conscience when it is weak, you sin against Christ.
13 Therefore, if food causes my brother to stumble, I will eat no meat forever more, that I don’t cause my brother to stumble.