Hebrew 12 15 good news

A beautiful passage!

The passage you're referring to is likely:

"See to it, brothers and sisters, that none of you has a sinful, unbelieving heart, so as not to fall away from the living God. But encourage one another daily, as long as it is called 'Today,' so that none of you may be hardened by sin's deceitfulness. We have come to share in Christ, if indeed we hold our original conviction firmly to the very end. As for us, we have these promises: If we are willing and obedient, he will make our ears listen to him. But if we are stubborn and refuse to listen, the Lord will laugh at our plans. But if they will obey and serve him, they will eat the best from the land—and their inheritance will be a lasting joy. We have stumbled; yet he remains standing. By his grace, let us boldly approach the throne of our merciful God, who has received us as his children. For we know that the one who began a good work in us will be faithful to complete it until the day of Christ Jesus."

— Hebrews 12:15-17, 18-21, 22-24 (NIV)

This passage is encouraging believers to remain faithful and obedient to God, despite the challenges and temptations they may face. It reminds them that God is merciful and willing to help them, and that He will complete the good work He has started in them.