Parashas Masei · Passuk 35:31 · TT note 1
Chabad.org — English translation + Rashi
Torah Temimah points to Kesuvos 37b (TT note on “וְלֹא תִקְחוּ כֹפֶר”).
English: What does “you shall not take ransom” mean? You shall not take money from him and exempt him.
Absolute bar on monetary commutation of a capital murder sentence.
No payment can free a convicted intentional murderer from the death penalty.