Genesis 38:13-14

Meanwhile, Tamar had learned that Shelah had grown up, but Judah had still not given him to her to father a child for her deceased husband. So, when Tamar found out her father-in-law was coming to Timnah for the sheep-shearing, she removed her widow’s clothes and covered herself with a veil to disguise herself. And she sat waiting at the crossroads where Judah would have to pass by.