Hebrews 3:8

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

Matthew 13:15

Because the heart of this people is waxed gross, and they heard heavily with their ears, and closed their eyes; lest they may see with their eyes, and hear with their ears, and understand with their hearts, and turn, and I shall heal them.

Acts 19:9

But when some were becoming hardened and disbelieving, speaking evil of the way in the presence of the multitude, departing from them he separated his disciples, daily expounding in the school of Tyrannus.

Romans 2:5-6

But according to thy hardness and thy impenitent heart, thou art treasuring up to thyself wrath against the day of wrath and of the revelation of the righteous judgment of God;

1 Corinthians 10:9

Neither let us tempt the Lord, as some of them tempted Him, and were destroyed by serpents.

Hebrews 3:12-13

See, brethren, lest at some time there shall be in some one of you an evil heart of unbelief, in turning away from the living God:

Treasury of Scripture Knowledge

Summary

Hebrews 3:8

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

Harden

Of

1 Corinthians 10:9

General references

Luke 8:6

Bible References

Harden

See, brethren, lest at some time there shall be in some one of you an evil heart of unbelief, in turning away from the living God:

But according to thy hardness and thy impenitent heart, thou art treasuring up to thyself wrath against the day of wrath and of the revelation of the righteous judgment of God;

Of

Neither let us tempt the Lord, as some of them tempted Him, and were destroyed by serpents.

General references

And other fell on the rock; and springing up, withered away, because it had no moisture.