Genesis 38:14; Genesis 38:15

14 she took off her widow’s clothes, covered herself with a veil to disguise herself, and then sat down at the entrance to Enaim, which is on the road to Timnah. For she saw that, though Shelah had now grown up, she had not been given to him as his wife.

15 When Judah saw her, he thought she was a prostitute, for she had covered her face.