For your servant became surety for the lad to my father: For, which translates the Hebrew ki, serves here to introduce still another feature of Judah’s argument. We may say, for example, “In addition,” “That is not all,” or “What is more” (Good News Translation). For became surety see the rest of verse 32 and comments on 43.9.

Quoted with permission from Reyburn, William D. and Fry, Euan McG. A Handbook on Genesis. (UBS Helps for Translators). New York: UBS, 1997. For this and other handbooks for translators see here .