'Sin' in the Bible

So, crying to the Lord, they said, Give ear to our prayer, O Lord, give ear, and do not let destruction overtake us because of this man's life; do not put on us the sin of taking life without cause: for you, O Lord, have done what seemed good to you.

Should I not have compassion on Nineveh, the great city in which there are more than 120,000 [innocent] persons, who do not know the difference between their right and left hand [and are not yet accountable for sin], as well as many [blameless] animals?”