G4645–σκληρύνω–sklērunō

But because some of the people were hard-hearted and would not give hearing, saying evil words about the Way before the people, he went away from them, and kept the disciples separate, reasoning every day in the school of Tyrannus.

ἐσκληρύνοντο esklērunonto “were hardened”

So then, at his pleasure he has mercy on a man, and at his pleasure he makes the heart hard.

σκληρύνει. sklērunei “He hardens.”

Be not hard of heart, as when you made me angry, on the day of testing in the waste land,

σκληρύνητε sklērunēte “shall harden”

But give comfort to one another every day as long as it is still Today; so that no one among you may be made hard by the deceit of sin:

σκληρυνθῇ sklērunthēa “may be hardened”

As it is said, Today if you will let his voice come to your ears, be not hard of heart, as when you made him angry.

σκληρύνητε sklērunēte “shall harden”

After a long time, again naming a certain day, he says in David, Today (as he had said before), Today if you will let his voice come to your ears, be not hard of heart,

σκληρύνητε sklērunēte “shall harden”