Luke 13:24

Strive to enter in through the strait gate; for many, I say to you, will seek to enter in, and shall not be able.

Hebrews 4:11

Let us earnestly strive, therefore, to enter into that rest, lest any one fall after the same example of unbelief.

Hebrews 6:11-12

But we desire every one of you to show the same diligence, in order to have your hope fully assured to the end:

2 Peter 1:5

so, even for this very purpose, uniting to these things all diligence, add to your faith, virtue; and to virtue, knowledge;

2 Peter 1:10

Wherefore, brethren, give the greater diligence to make your calling and election sure: for if you do these things, you will never fall.

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
Strive to enter in through the strait gate; for many, I say to you, will seek to enter in, and shall not be able.
Hebrews 4:11
Let us earnestly strive, therefore, to enter into that rest, lest any one fall after the same example of unbelief.
Hebrews 6:11
But we desire every one of you to show the same diligence, in order to have your hope fully assured to the end:
2 Peter 1:5
so, even for this very purpose, uniting to these things all diligence, add to your faith, virtue; and to virtue, knowledge;