1 Corinthians 15:2
By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.

Philippians 2:16
as you hold forth the word of life, in order that I may boast on the day of Christ that I did not run or labor in vain.

2 Corinthians 11:3
I am afraid, however, that just as Eve was deceived by the serpent’s cunning, your minds may be led astray from your simple and pure devotion to Christ.

2 Corinthians 6:1
As God’s fellow workers, then, we urge you not to receive God’s grace in vain.

1 Thessalonians 3:5
For this reason, when I could bear it no longer, I sent to find out about your faith, for fear that the tempter had somehow tempted you and that our labor might have been in vain.

Hebrews 4:1
Therefore, while the promise of entering His rest still stands, let us be careful that none of you be deemed to have fallen short of it.

2 John 1:8
Watch yourselves, so that you do not lose what we have worked for, but that you may be fully rewarded.

1 Corinthians 3:10-15
By the grace God has given me, I laid a foundation as an expert builder, and someone else is building on it. But each one must be careful how he builds. / For no one can lay a foundation other than the one already laid, which is Jesus Christ. / If anyone builds on this foundation using gold, silver, precious stones, wood, hay, or straw, ...

2 Corinthians 12:20-21
For I am afraid that when I come, I may not find you as I wish, and you may not find me as you wish. I fear that there may be quarreling, jealousy, rage, rivalry, slander, gossip, arrogance, and disorder. / I am afraid that when I come again, my God will humble me before you, and I will be grieved over many who have sinned earlier and have not repented of their acts of impurity, sexual immorality, and debauchery.

Romans 11:21-22
For if God did not spare the natural branches, He will certainly not spare you either. / Take notice, therefore, of the kindness and severity of God: severity to those who fell, but kindness to you, if you continue in His kindness. Otherwise you also will be cut off.

Colossians 1:23
if indeed you continue in your faith, established and firm, not moved from the hope of the gospel you heard, which has been proclaimed to every creature under heaven, and of which I, Paul, have become a servant.

Hebrews 12:15
See to it that no one falls short of the grace of God, and that no root of bitterness springs up to cause trouble and defile many.

Matthew 15:9
They worship Me in vain; they teach as doctrine the precepts of men.’”

Isaiah 49:4
But I said, “I have labored in vain, I have spent My strength in futility and vanity; yet My vindication is with the LORD, and My reward is with My God.”

Jeremiah 8:8-9
How can you say, ‘We are wise, and the Law of the LORD is with us,’ when in fact the lying pen of the scribes has produced a deception? / The wise will be put to shame; they will be dismayed and trapped. Since they have rejected the word of the LORD, what wisdom do they really have?