C. F. Keil and Franz Delitzsch on Genesis 38:15-18

Gen 38:15-18

When Judah saw her here and took her for a harlot, he made her an offer, and gave her his signet-ring, with the band (פּתיל) by which it was hung round his neck, and his staff, as a pledge of the young buck-goat which he offered her. They were both objects of value, and were regarded as ornaments in the East, as Herodotus (i. 195) has shown with regard to the Babylonians (see my Bibl. Arch. 2, 48). He then lay with her, and she became pregnant by him.