Luke 13:24

But He said unto them, Strive to enter in at the strait gate; for I tell you, many will desire to enter in, and shall not be able.

Hebrews 4:11

Let us labour therefore to enter into that rest, least any one fall after the same example of unbelief.

Hebrews 6:11-12

And we desire that every one of you would shew the same diligence to acquire the full assurance of hope even unto the end:

2 Peter 1:5

And to this giving all diligence, add to your faith fortitude;

2 Peter 1:10

Wherefore, my brethren, be the more diligent thus to make your calling and election sure; for if ye do these things ye shall 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
But He said unto them, Strive to enter in at the strait gate; for I tell you, many will desire to enter in, and shall not be able.
Hebrews 4:11
Let us labour therefore to enter into that rest, least any one fall after the same example of unbelief.
Hebrews 6:11
And we desire that every one of you would shew the same diligence to acquire the full assurance of hope even unto the end:
2 Peter 1:5
And to this giving all diligence, add to your faith fortitude;