You must redeem every firstborn donkey with a lamb, and if you do not redeem it, you are to break its neck. And every firstborn of your sons you must redeem.
Jewish Publication Society of America Version (JPS1917) - Exodus 13:13 >And every firstling of an ass thou shalt redeem with a lamb; and if thou wilt not redeem it, then thou shalt break its neck; and all the first-born of man among thy sons shalt thou redeem.