וַיִּרְאֶ֣הָ יְהוּדָ֔ה וַֽיַּחְשְׁבֶ֖הָ לְזוֹנָ֑ה כִּ֥י כִסְּתָ֖ה פָּנֶֽיהָ׃
When Judah saw her, he thought her to be a harlot; for she had covered her face.
Read kabbalistic (mystical) interpretation of Genesis 38:15: and classical mystical sources.