Hebrews 3 | NASB

Therefore, holy brethren, partakers of a heavenly calling, consider Jesus, the Apostle and High Priest of our confession; 2 He was faithful to Him who appointed Him, as Moses also was in all His house. 3 For He has been counted worthy of more glory than Moses, by just so much as the builder of the house has more honor than the house. 4 For every house is built by someone, but the builder of all things is God. 5 Now Moses was faithful in all His house as a servant, for a testimony of those things which were to be spoken later; 6 but Christ was faithful as a Son over His house—whose house we are, if we hold fast our confidence and the boast of our hope firm until the end.

7 Therefore, just as the Holy Spirit says,

“ Today if you hear His voice ,
8 Do not harden your hearts aswhen they provoked Me ,
As in the day of trial in the wilderness ,
9 Where your fathers tried Me by testing  Me,
And saw My works forforty years .
10 “ Therefore I was angry with this generation ,
And said, ‘They always go astray in their heart ,
And they did not know My ways ’;
11 As I swore in My wrath,
‘ They shall not enter My rest .’”

The Peril of Unbelief

12 Take care, brethren, that there not be in any one of you an evil, unbelieving heart that falls away from the living God. 13 But encourage one another day after day, as long as it is still called “Today,” so that none of you will be hardened by the deceitfulness of sin. 14 For we have become partakers of Christ, if we hold fast the beginning of our assurance firm until the end, 15 while it is said,

“ Today if you hear His voice ,
Do not harden your hearts, aswhen they provoked Me .”

16 For who provoked Him when they had heard? Indeed, did not all those who came out of Egypt led by Moses? 17 And with whom was He angry for forty years? Was it not with those who sinned, whose bodies fell in the wilderness? 18 And to whom did He swear that they would not enter His rest, but to those who were disobedient? 19 So we see that they were not able to enter because of unbelief.