Isaiah 49:4
"Then I said, I have laboured in vain, I have spent my strength for nought, and in vain: yet surely my judgment is with the LORD, and my work with my God."
Cross References (ranked by relevance)
Say to them that are of a fearful heart, Be strong, fear not: behold, your God will come with vengeance, even God with a recompence; he will come and save you.
I am afraid of you, lest I have bestowed upon you labour in vain.
And I will very gladly spend and be spent for you; though the more abundantly I love you, the less I be loved.
Yet if thou warn the wicked, and he turn not from his wickedness, nor from his wicked way, he shall die in his iniquity; but thou hast delivered thy soul.
Behold, the Lord GOD will come with strong hand, and his arm shall rule for him: behold, his reward is with him, and his work before him.
O Jerusalem, Jerusalem, thou that killest the prophets, and stonest them which are sent unto thee, how often would I have gathered thy children together, even as a hen gathereth her chickens under her wings, and ye would not!
Behold, the LORD hath proclaimed unto the end of the world, Say ye to the daughter of Zion, Behold, thy salvation cometh; behold, his reward is with him, and his work before him.
For we are unto God a sweet savour of Christ, in them that are saved, and in them that perish:
They shall not labour in vain, nor bring forth for trouble; for they are the seed of the blessed of the LORD, and their offspring with them.
Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me.
I have spread out my hands all the day unto a rebellious people, which walketh in a way that was not good, after their own thoughts;
Ought not Christ to have suffered these things, and to enter into his glory?
He came unto his own, and his own received him not.
But to Israel he saith, All day long I have stretched forth my hands unto a disobedient and gainsaying people.
Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
And your strength shall be spent in vain: for your land shall not yield her increase, neither shall the trees of the land yield their fruits.