'Themselves' in the Bible

I wish that those who are troubling you [by teaching that circumcision is necessary for salvation] would even [go all the way and] castrate themselves!

For even the circumcised [Jews] themselves do not [really] keep the Law, but they want to have you circumcised so that they may boast in your flesh [that is, in the fact that they convinced you to be circumcised].

Peace and mercy be upon all who walk by this rule [who discipline themselves and conduct their lives by this principle], and upon the [true] Israel of God (Jewish believers).