1 Corinthians 8:12

“But when ye sin so against the brethren, etc.] Through sitting at meat in an idol’s temple, and thereby violating the new commandment of love; by which saints are obliged to love one another as brethren, and take care to do nothing that may hurt and prejudice one another’s peace and comfort, it being an incumbent duty upon them by love to serve one another: and wound their weak conscience: as before observed: it is contrary to the law of love to wound a brother; it is an aggravation of the sin to wound a weak one; what greater cruelty than to strike or beat, as the word here used signifies, a sick and infirm man? and greater still to strike and wound his conscience than any part of his body;…”

“wound their weak conscience--literally, "smite their conscience, being (as yet) in a weak state." It aggravates the cruelty of the act that it is committed on the weak, just as if one were to strike an invalid. against Christ--on account of the sympathy between Christ and His members (Mat 25:40; Act 9:4-5).”

“But when ye sin so against the brethren - This is designed further to show the evil of causing others to sin; and hence, the evil which might arise from partaking of the meat offered to idols. The word sin here is to be taken in the sense of “injuring, offending, leading into sin.” You violate the law which requires you to love your brethren, and to seek their welfare, and thus you sin against them. Sin is properly against God; but there may be a course of injury pursued against people, or doing them injustice or wrong, and this is sin against them. Christians are bound to do right toward all. And wound their weak conscience - The word “wound” here (τύπτοντες tuptontes, “smiting, beating”)…”

“Ye sin against Christ - Whose members they are. 1 Corinthians 8:13”

“8:12 To make immature believers sin by violating their conscience is the same as sinning against Christ, who has claimed them for himself (cp. Matt 25:40, 45).”

“when: Gen 20:9, Gen 42:22; Exo 32:21; Sa1 2:25, Sa1 19:4, Sa1 19:5, Sa1 24:11; Mat 18:21 ye sin against: Co1 12:12; Exo 16:8; Mat 12:49, Mat 12:50, Mat 18:10, Mat 18:11, Mat 25:40, Mat 25:45; Act 9:4, Act 9:5 1 Corinthians 8:13”