'Cross' in the Bible

But I, brothers, if I still preach circumcision, why am I still persecuted? Then the stumbling block of the cross has been removed.

As many as desire to look good in the flesh, they compel you to be circumcised; only that they may not be persecuted for the cross of Christ.

But far be it from me to boast, except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world.