Indeed, under the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness of sins. – Hebrews 9:22

Though there be pardon of sin, it is never without blood. That is a sweeping sentence, for there are some in this world that are trusting for the pardon of sin to their repentance. It, beyond question, is your duty to repent of your sin. If you have disobeyed God, you should be sorry for it. To cease from sin is but the duty of the creature, else sin is not the violation of God’s holy law. But be it known unto you, that all the repentance in the world cannot blot out the smallest sin. If you had only one sinful thought cross your mind, and you should grieve over that all the days of your life, yet the stain of that sin could not be removed even by the anguish it cost you. Repentance is the work of the Spirit of God, it is a very precious gift, and is a sign of grace; but there is no atoning power in repentance. In a sea full of penitential tears, there is not the power or the virtue to wash out one spot of this hideous uncleanness. Without the blood-shedding, there is no remission. But others suppose that, at any rate, active reformation growing out of repentance may achieve the task. What if drunkenness be given up, and temperance become the rule? What if licentiousness be abandoned, and chastity adorn the character? What if dishonest dealing be relinquished, and integrity be scrupulously maintained in every action? I say, ’tis well; I would to God such reformations took place everywhere-yet for all that, debts already incurred are not paid by our not getting into debt further, and past delinquencies are not condoned by future good behaviour. So sin is not remitted by reformation. …The cry in the olden days was, “Wherewithal shall we come before God?” Here stands the sentence; here for ever must it stand, “Without shedding of blood there is no remission.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3418.cfm