Your righteousness [is] an everlasting righteousness, Psalms 119:142(NKJV)
The righteousness of the law was temporary because it depended on animal blood merely covering the sins of the people for a season. Their hearts were not changed and they lived with sin consciousness so they would continue to sin and thus require more animal sacrifices – Hebrews 10:1-4 But God has given us His own Righteousness through the once and for all sacrifice of His Son Jesus Christ – Hebrews 9:12.On the Cross Jesus took our sin and gave us His Righteousness.We have been made the Righteousness of God through Jesus Christ – 2 Corinthians 5:21. We did nothing to get this Righteousness. It’s a gift from God – Romans 5:17. It’s received by Faith – Romans 3:28. It doesn’t depend on anything we do. We don’t get out of this righteousness. It’s an everlasting righteousness – Daniel 9:24 …To bring in everlasting righteousness… In Christ Jesus you’re righteous forever.