Galatians 2:18
For if I try to build up again what I had already destroyed [i.e., by returning to depend on compliance with the law of Moses to become right with God, after having rejected this system by trusting in Christ to save me], I would certainly be guilty of sin.
Romans 14:15
For if your brother is hurt [spiritually] by [your eating a certain] food, you are no longer acting lovingly [toward him]. Do not destroy [spiritually] the person Christ died for by what you eat.
1 Corinthians 8:11-12
So, this weak brother, for whose sake Christ died, becomes [spiritually] destroyed, [and all] because of your "knowledge" [i.e., you know that such eating is harmless, but your weak brother does not know this, so he is led into sin by your unloving example].
Galatians 2:4-5
For [certain] false brothers, who were secretly brought in to observe us practicing our liberty in Christ Jesus [i.e., by not having Titus circumcised], attempted to place us [back] under the bondage [of Mosaic law keeping].
Galatians 2:12-16
For, before certain [leaders] came from James [i.e., Jesus' brother, a leader of the Jerusalem church, See Acts 12:17; 15:13-22], he had eaten [a social meal] with some Gentiles. But when these men came, he abruptly discontinued this practice out of fear of the circumcised ones [i.e., out of concern for what the Jews would think of him].
Galatians 4:9-12
But now that you have come to know God [as your Father], or rather, to be known by Him [as His children], how can you turn back again to the weak, cheap, elementary teachings [of the law of Moses], to which you [seem to] desire to become enslaved?
Galatians 5:11
But, brothers, if I were still preaching [that a person had] to be circumcised, why am I being persecuted? [Note: Paul's argument seems to be "I must not be preaching circumcision since I am being persecuted by those who believe in it"]. [If I preached that a person had to be circumcised] then my preaching that Christ died on the cross would not be such an offense [to those who believe in it].
Galatians 2:21
[In doing this] I am not trying to disregard God's unearned favor, for if a person could become right with God by [perfect obedience to the requirements of] the law of Moses, then Christ died for nothing.