1 Corinthians 8:12

but when you thus offend against the brethren, by wounding their weak conscience, you sin against Christ.

Matthew 25:45

to this he will reply, I declare unto you, your not doing this for one of the least of these, is the same thing as not doing it for me.

Matthew 18:6

But whoever shall occasion such an humble believer to fall off from the faith, it were better for him that a mill-stone were hang'd about his neck, and that he were plung'd to the bottom of the sea.

Matthew 12:49-50

and holding out his hand towards his disciples, see there, said he, my mother, and my brothers.

Matthew 18:10

take care not to despise one of such an humble disposition: for I tell you, that in heaven their angels are continually attending the presence of my father who is in heaven:

Matthew 18:21

Then Peter advancing to him, said, Lord, if my brother injures me, how many injuries must I forgive him? must I forgive him seven?

Matthew 25:40

and the king will reply, I declare unto you, your having done this for one of the least of these my brethren, is the same thing as doing it for me.

Acts 9:4-5

and he fell to the ground, and heard a voice which said to him, Saul, Saul, why persecutest thou me?

1 Corinthians 12:12

For as the body is one, tho' it has many members, and all the members of that one body, tho' many, are one body: so also is the body of Christ.

Treasury of Scripture Knowledge

Summary

But when ye sin so against the brethren, and wound their weak conscience, ye sin against Christ.

Bible References

When

Matthew 18:21
Then Peter advancing to him, said, Lord, if my brother injures me, how many injuries must I forgive him? must I forgive him seven?

Ye sin against

1 Corinthians 12:12
For as the body is one, tho' it has many members, and all the members of that one body, tho' many, are one body: so also is the body of Christ.
Matthew 12:49
and holding out his hand towards his disciples, see there, said he, my mother, and my brothers.
Matthew 18:10
take care not to despise one of such an humble disposition: for I tell you, that in heaven their angels are continually attending the presence of my father who is in heaven:
Matthew 25:40
and the king will reply, I declare unto you, your having done this for one of the least of these my brethren, is the same thing as doing it for me.
Acts 9:4
and he fell to the ground, and heard a voice which said to him, Saul, Saul, why persecutest thou me?

General references

2 Corinthians 6:3
as for us, we give no occasion of offence, that our ministry may not be blamed:
Galatians 2:18
on the contrary, if I re-establish what I have demolish'd, I show myself a prevaricator.
Philippians 2:4
let no man consult only his private interest, but let every man consult likewise the interest of others.