Luke 13:24

"Strain every nerve to force your way in through the narrow gate," He answered; "for multitudes, I tell you, will endeavour to find a way in and will not succeed.

Hebrews 4:11

Let it then be our earnest endeavour to be admitted to that rest, so that no one may perish through following the same example of unbelief.

Hebrews 6:11-12

But we long for each of you to continue to manifest the same earnestness, with a view to your enjoying fulness of hope to the very End;

2 Peter 1:5

But for this very reason--adding, on your part, all earnestness-- along with your faith, manifest also a noble character: along with a noble character, knowledge;

2 Peter 1:10

For this reason, brethren, be all the more in earnest to make sure that God has called you and chosen you; for it is certain that so long as you practise these things, you will never stumble.

Treasury of Scripture Knowledge

Summary

And they returned to Joshua, and said unto him, Let not all the people go up; but let about two or three thousand men go up and smite Ai; and make not all the people to labour thither; for they are but few.

Bible References

About two

Luke 13:24
"Strain every nerve to force your way in through the narrow gate," He answered; "for multitudes, I tell you, will endeavour to find a way in and will not succeed.
Hebrews 4:11
Let it then be our earnest endeavour to be admitted to that rest, so that no one may perish through following the same example of unbelief.
Hebrews 6:11
But we long for each of you to continue to manifest the same earnestness, with a view to your enjoying fulness of hope to the very End;
2 Peter 1:5
But for this very reason--adding, on your part, all earnestness-- along with your faith, manifest also a noble character: along with a noble character, knowledge;