\v=15
\v~=And when Pharao hardened \add his heart so as not\add* to send us away, he slew every first-born in the land of Egypt, both the first-born of man and the first-born of beast; therefore do I sacrifice every \add offspring\add* that opens the womb, the males to the Lord, and every first-born of my sons I will redeem. 
\¬v