en_tn_condensed/mat/23/27.md

you are like whitewashed tombs ... unclean

The scribes and Pharisees may appear to be pure on the outside, but they are wicked on the inside.

whitewashed tombs

"tombs that someone has painted white." The Jews would paint tombs white so that people would easily see them and avoid touching them. Touching a tomb would make a person ceremonially unclean.