Deuteronomy 20 16
However, when it comes to the towns of those nations whose land the Lord your God is giving you to occupy, don't leave anything alive that breathes.
Compare with other 3 random translations
WEB Deuteronomy 20:16But of the cities of these peoples that Yahweh your God gives you for an inheritance, you shall save alive nothing that breathes;
YLT Deuteronomy 20:16'Only, of the cities of these peoples which Jehovah thy God is giving to thee for an inheritance, thou dost not keep alive any breathing;
NIV Deuteronomy 20:16However, in the cities of the nations the Lord your God is giving you as an inheritance, do not leave alive anything that breathes.