Hebrews
2:1-3a
For this reason we must pay much closer attention to what we have heard, so that we do not drift away from it. For if the word spoken through angels proved unalterable, and every transgression and disobedience received a just penalty, how will we escape if we neglect so great a salvation?
3:6-11
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. Therefore, just as the Holy Spirit says, “Today if you hear his voice, do not harden your hearts as when they provoked me, as in the day of trial in the wilderness, where your fathers tried me by testing me, and saw my works for forty years. Therefore I was angry with this generation, and said, ‘They always go astray in their heart, and they did not know my ways, as I swore in my wrath, they shall not enter my rest.'”
3:12-14
Take care, brethren, that there not be in any one of you an evil, unbeleiving heart that falls away from the living God. 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. For we have become partakers of Christ, if we hold fast the beginning of our assurance firm until the end…
4:1, 9, 11
Therefore, let us fear if, while a promise remains of entering His rest, any one of you may seem to have come short of it…. So there remains a Sabbath rest for the people of God…. Therefore let us be diligent to enter that rest, so that no one will fall, through following the same example of disobedience.
6:3-8
And this we will do, if God permits. For in the case of those who hae once been enlightened and have tasted of the heavenly gift and make partakers of the Holy Spirit, and have tasted the good word of God and the powers of the age to come, and then have fallen away, it is impossible to renew them again to repentance, since they again crucify to themselves the Son of God and put Him to open shame. For ground that drinks the rain which often falls on it and brings forth vegetation useful to those for whose sake it is also tilled, receives a blessing from God; but if it yields thorns and thistles, it is worthless and close to being cursed, and it ends up being burned.
6:9-12
But, beloved, we are convinced of better things concerning you, and things that accompany salvation, though we are speaking in this way. For God is not unjust so as to forget your work and the love which you have shown toward His name, in having ministered and in still ministering to the saints. And we desire that each one of you show the same diligence so as to realize the full assurance of hope until the end, so that you will not be sluggish, but imitators of those who through faith and patience inherit the promises.
10:19-24
Therefore, brethren, since we have confidence to enter the holy place by the blood of Jesus, by a new and living way which He inaugurated for us through the veil, that is, His flesh, and since we have a great priest over the house of God, let us draw near with a sincere heart in full assurance of faith, having our hearts sprinkled clean from an evil conscience and our bodies washed with pure water. Let us hold fast the confession of our hope without wavering, for He who promised is faithful, and let us consider how to stimulate one another to love and good deeds…
10:26-27, 29
For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a terrifying expectation of judgment and the fury of a fire which will consume the adversaries…. How much severer punishment do you think he will deserve who has trampled under foot the Son of God, and has regarded as unclean the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace?
12:1-3
Therefore…let us also lay aside every encumbrance and the sin which so easily entangles us, and let us run with endurance the race that is set before us, fixing our eyes on Jesus, the author and perfecter of faith….For consider Him who has endured such hostility by sinners against Himself, so that you will not grow weary and lose heart.
12:12-13
Therefore strengthen the hands that are weak and the knees that are feeble, and make straight paths for your feet, so that the limb which is lame may not be put out of joint, but rather be healed.
12:15
See to it that no one comes short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled.
13:21
[Now the God of peace…] equip you in every good thing to do His will, working in us that which is pleasing in His sight, through Jesus Christ, to whom be the glory forever and ever. Amen.