Hebrews 3:8

8notμὴhardenσκληρύνητεtheτὰςheartsκαρδίαςof youὑμῶνasὡςinἐνtheτῷrebellionπαραπικρασμῷ,inκατὰtheτὴνdayἡμέραντοῦof testingπειρασμοῦinἐνtheτῇwildernessἐρήμῳ,

do not harden your⁺ hearts, as in the rebellion, in the day of testing in the wilderness,