Here are many Bible verses about diligence.

The soul of the sluggard craves and gets nothing, while the soul of the diligent is richly supplied.- Proverbs 13:4

A slack hand causes poverty, but the hand of the diligent makes rich.- Proverbs 10:4

And let us not grow weary of doing good, for in due season we will reap, if we do not give up.- Galatians 6:9

Therefore, my beloved brothers, be steadfast, immovable, always abounding in the work of the Lord, knowing that in the Lord your labor is not in vain.- 1 Corinthians 15:58

Do you see a man skillful in his work? He will stand before kings; he will not stand before obscure men.- Proverbs 22:29

Therefore, brothers, be all the more diligent to make your calling and election sure, for if you practice these qualities you will never fall.- 2 Peter 1:10

Therefore, beloved, since you are waiting for these, be diligent to be found by him without spot or blemish, and at peace.- 2 Peter 3:14

Whoever diligently seeks good seeks favor, but evil comes to him who searches for it.- Proverbs 11:27

Blessed is the man who remains steadfast under trial, for when he has stood the test he will receive the crown of life, which God has promised to those who love him.- James 1:12

I press on toward the goal for the prize of the upward call of God in Christ Jesus.- Philippians 3:14

Whatever you do, work heartily, as for the Lord and not for men,- Colossians 3:23

But as you excel in everything—in faith, in speech, in knowledge, in all earnestness, and in our love for you—see that you excel in this act of grace also.- 2 Corinthians 8:7

And we desire each one of you to show the same earnestness to have the full assurance of hope until the end,- Hebrews 6:11

For this very reason, make every effort to supplement your faith with virtue, and virtue with knowledge, and knowledge with self-control, and self-control with steadfastness, and steadfastness with godliness, and godliness with brotherly affection, and brotherly affection with love.- 2 Peter 1:5-7

And every work that he undertook in the service of the house of God and in accordance with the law and the commandments, seeking his God, he did with all his heart, and prospered.- 2 Chronicles 31:21

Preach the word; be ready in season and out of season; reprove, rebuke, and exhort, with complete patience and teaching.- 2 Timothy 4:2

I hasten and do not delay to keep your commandments.- Psalm 119:60

Therefore, since we are surrounded by so great a cloud of witnesses, let us also lay aside every weight, and sin which clings so closely, and let us run with endurance the race that is set before us, looking to Jesus, the founder and perfecter of our faith, who for the joy that was set before him endured the cross, despising the shame, and is seated at the right hand of the throne of God.- Hebrews 12:1-2

You have commanded your precepts to be kept diligently.- Psalm 119:4