Psalm 95:10 Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways: 11 Unto whom I sware in my wrath that they should not enter into my rest.
Isaiah 11:10 And in that day there shall be a root of Jesse, which shall stand for an ensign of the people; to it shall the Gentiles seek: and his rest shall be glorious.
28:11 For with stammering lips and another tongue will he speak to this people.
28:12 To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear.
30:15 For thus saith the Lord God, the Holy One of Israel; In returning and rest shall ye be saved; in quietness and in confidence shall be your strength: and ye would not.
Jeremiah 6:16 Thus saith the Lord, Stand ye in the ways, and see, and ask for the old paths, where is the good way, and walk therein, and ye shall find rest for your souls. But they said, We will not walk therein.
And Jesus said:
Matthew 11:28 Come unto me, all ye that labour and are heavy laden, and I will give you rest.
11:29 Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.
Hebrews 3:18 And to whom sware he that they should not enter into his rest, but to them that believed not?
3:19 So we see that they could not enter in because of unbelief.
Hebrews 4:1 Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it.
4:2 For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.
4:3 For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.
4:4 For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works.
4:5 And in this place again, If they shall enter into my rest.
4:6 Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief:
4:8 For if Jesus had given them rest, then would he not afterward have spoken of another day.
4:9 There remaineth therefore a rest to the people of God.
4:10 For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
4:11 Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
In the old testament, we see that the Lord was grieved with the children of Israel because they murmured, complained and did not believe therefore they spent 40 years in the wilderness. Due to the unbelief in their hearts, they did not enter into the Lord's saving rest.
Through Isaiah the prophet, we hear the Lord prophecy that through the root of Jesse, who is Jesus, that the Gentiles during the age of grace, could be saved by entering into his rest. The Lord also warns that they, or many, would not hearken. Moreover, the Lord talked about a portion of the new testament salvation. He said with stammering lips and another tongue will he speak to us and this is the refreshing. This refreshing and speaking in tongues is the infilling of the Holy Ghost of Jesus Christ:
Acts 3:19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
I believe that the refreshing the Lord speaks of is the Holy Ghost because Acts 3:19 was just another way to say Acts 2:38:
Acts 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Acts 3:19 and 2:38 are the same message, just stated differently.
In the new testament, the message is clear that belief is essential and that we must cease from our works (circumcision, law, etc.). We are all unrighteous and our righteousness is as filthy rags. We are not good enough no matter how good we think we are because we compare to mankind, to each other, and not the righteousness of the Lord. Infilling of the Holy Ghost through belief, repentance (from the heart), surrender and obedience to Acts 2:38 is the way to enter into his glorious and amazing rest!!!