TSK
Treasury of Scripture Knowledge references in NET.
“But if anyone causes one of these little ones who believe in me to sin, it would be better for him to have a huge millstone hung around his neck and to be drowned in the open sea.
But be careful that this liberty of yours does not become a hindrance to the weak.
To the weak I became weak in order to gain the weak. I have become all things to all people, so that by all means I may save some.
Do not give offense to Jews or Greeks or to the church of God,
We did this as a precaution so that no one should blame us in regard to this generous gift we are administering.