“King David had unrelenting confidence in God’s mercy after he failed” – International House of Prayer

King David built up a strong saving faith because he knew God’s character and covenant because loved to study God’s laws and perform them.

Psalms 119:92
“Unless Thy law had been my delights, I should then have perished in mine affliction.”

King David learned to love God’s ways and judgment because it produced powerful results; that’s why he knew he could trust God’s character and all the promises of His covenant.

1Samuel 17:37
“David said moreover, The LORD that delivered me out of the paw of the lion, and out of the paw of the bear, He will deliver me out of the hand of this Philistine. And Saul said unto David, Go, and the LORD be with thee.”

King David didn’t do these things apart from God, he cooperated with God in order to do them. The LORD was his teacher. It’s God who first seeks out and calls sinners to Himself, we get to choose how we answer that call.

The Body of Christ needs this type of faith. King David gives a great formula for success, he received it from the LORD. God wants 100% of our hearts, thoughts, strength and actions.

He humbly admitted he had sinned taking responsibility for his actions (confession) and justified God by acknowledging his wrong then turning away from it (repentance) – he obeyed the gospel of Jesus Christ (scriptures down below).

Psalms 119:75-77
I know, O LORD, that Thy judgments are right, and that Thou in faithfulness hast afflicted me. Let, I pray Thee, Thy merciful kindness be for my comfort, according to Thy word unto Thy servant. Let Thy tender mercies come unto me, that I may live: FOR Thy law is my delight.”

Psalms 119:10-16
“With my whole heart have I sought Thee: O let me not wander from Thy commandments. Thy word have I hid in mine heart, that I might not sin against Thee. Blessed art Thou, O LORD: teach me Thy statutes. With my lips have I declared all the judgments of Thy mouth. I have rejoiced in the way of Thy testimonies, as much as in all riches. I will meditate in Thy precepts, and have respect unto Thy ways. I will delight myself in Thy statutes: I will not forget Thy word.”

King David probably studied the book of Job:

Job 36:5-15
“Behold, God is mighty, and despiseth not any: He is mighty in strength and wisdom. He preserveth not the life of the wicked: but giveth right to the poor. He withdraweth not His eyes from the righteous: but with kings are they on the throne; yea, He doth establish them for ever, and they are exalted. And if they be bound in fetters, and be holden in cords of affliction;

then He sheweth them their work, and their transgressions that they have exceeded.

He openeth also their ear to discipline, and commandeth that they return from iniquity.

If they obey and serve Him, they shall spend their days in prosperity, and their years in pleasures.

But if they obey not, they shall perish by the sword, and they shall die without knowledge. But the hypocrites in heart heap up wrath: they cry not when He bindeth them. They die in youth, and their life is among the unclean. He delivereth the poor in his affliction, and openeth their ears in oppression.”

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The apostle Paul pointed out that the prophet Isaiah in the Old Testament preached and taught the gospel message. The gospel message includes confession and repentance by faith in Jesus Christ.  Anyone who is saved can only be saved through the gospel of Jesus Christ and His blood of the Everlasting Covenant, including the Old Testament believers. “No other name given among men whereby we must be saved.”

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Romans 10:16
“But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report?”

2Thessalonians 1:8
“In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ”

1Peter 4:17
“For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God?”