Col 1:14 - In whom we have redemption through his blood, even the forgiveness of sins:

Redemption , from the Greek ‘apolytrōsis, (‘Strongs Lexicon: G729- Liberation procured by the payment of a ransom’)

My question is, who demanded a ransom? We are seeking exegetical evidence. That is, not just ‘who’, but where do we see this in the Bible.