Hebrews 3:8
"Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:"
Cross References (ranked by relevance)
Happy is the man that feareth alway: but he that hardeneth his heart shall fall into mischief.
And he called the name of the place Massah, and Meribah, because of the chiding of the children of Israel, and because they tempted the LORD, saying, Is the LORD among us, or not?
And they tempted God in their heart by asking meat for their lust.
But when his heart was lifted up, and his mind hardened in pride, he was deposed from his kingly throne, and they took his glory from him:
For this people’s heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
Yet they hearkened not unto me, nor inclined their ear, but hardened their neck: they did worse than their fathers.
Yet they tempted and provoked the most high God, and kept not his testimonies:
But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the LORD had said.
He is wise in heart, and mighty in strength: who hath hardened himself against him, and hath prospered?
He, that being often reproved hardeneth his neck, shall suddenly be destroyed, and that without remedy.
But lusted exceedingly in the wilderness, and tempted God in the desert.
Ye shall not tempt the LORD your God, as ye tempted him in Massah.
And he also rebelled against king Nebuchadnezzar, who had made him swear by God: but he stiffened his neck, and hardened his heart from turning unto the LORD God of Israel.
And the LORD said unto Moses, How long will this people provoke me? and how long will it be ere they believe me, for all the signs which I have shewed among them?
Wherefore then do ye harden your hearts, as the Egyptians and Pharaoh hardened their hearts? when he had wrought wonderfully among them, did they not let the people go, and they departed?
Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents.
But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.
But they and our fathers dealt proudly, and hardened their necks, and hearkened not to thy commandments,
Now be ye not stiffnecked, as your fathers were, but yield yourselves unto the LORD, and enter into his sanctuary, which he hath sanctified for ever: and serve the LORD your God, that the fierceness of his wrath may turn away from you.
Notwithstanding they would not hear, but hardened their necks, like to the neck of their fathers, that did not believe in the LORD their God.