Galatians 6:7-9

Do not be deceived, God is not mocked; for whatever a man sows, that he will also reap. 8 For he who sows to his flesh will of the flesh reap corruption, but he who sows to the Spirit will of the Spirit reap everlasting life. 9 And let us not grow weary while doing good, for in due season we shall reap if we do not lose heart.

Hebrews 6:12
that you do not become sluggish, but imitate those who through faith and patience inherit the promises.

Hebrews 10:23; 35-36
Let us hold fast the confession of our hope without wavering, for He who promised is faithful.
Therefore do not cast away your confidence, which has great reward. 36 For you have need of endurance, so that after you have done the will of God, you may receive the promise.