Hebrews 3:8

μὴ σκληρύνητε τὰς καρδίας ὑμῶν, ὡς ἐν τῷ παραπικρασμῷ, κατὰ τὴν ἡμέραν τοῦ πειρασμοῦ ἐν τῇ ἐρήμῳ,

mē sklērynēte tas kardias ymōn, ōs en tō parapikrasmō, kata tēn ēmeran toy peirasmoy en tē erēmō,

King James Version (KJV)

Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:

Modern English

do not harden your hearts as you did in the rebellion, during the time of testing in the wilderness,