Hebrew · Sifrei Devarim (Hebrew)
וקצתה את כפה. מלמד שאתה חייב (להצילה) [להצילו]. מנין שאם אין אתה יכול להצילו בכפה, הצילו בנפשה? ת"ל לא תחוס עינך.
English · Shraga Silverstein
(Devarim 25:12) "Then you shall cut off her hand": We are hereby taught that you are obligated to rescue him (from her). Whence is it derived that if you are not able to rescue him by (cutting off) her hand, you must rescue him by her soul (i.e., by killing her)? From "you shall have no pity."