ผู้ไร้บาปจะขว้างหินได้ก่อน

Missing, extremely new, or very obvious to obtain.

A reference to John 8:7-11 from the Bible, stating, "So when they continued asking him, he lifted himself, and said unto them, He that is without sin among you, let him first cast a stone at her. And again he stooped down, and wrote on the ground."