Cross reference
Mark 8:37
37 Or what shall a man give in exchange for his soul?
Psalms 49:7-8
7 None of them can by any means redeem his brother, nor give to God a ransom for him:
8 (For the redemption of their soul is precious, and it ceaseth for ever:)
1 Peter 1:18-19
18 Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;
19 But with the precious blood of Christ, as of a lamb without blemish and without spot: