Can a true elect and born again christian backslide ?

Hi to everyone.

It's said in hebrews 12:6-7 ( "For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.") that God will chastise his sons.

So, is it possible that a true born again believer backslide and get his heart harden for, someday, return ? What are you thoughts, based on the Scriptures, about this topic ?

Thanks for reading.