2 Samuel 1:5

And David said to the young man who gave him the news, Why are you certain that Saul and his son Jonathan are dead?

Proverbs 14:15

The simple man has faith in every word, but the man of good sense gives thought to his footsteps.

Proverbs 25:2

It is the glory of God to keep a thing secret: but the glory of kings is to have it searched out.

Treasury of Scripture Knowledge

Summary

And David said unto the young man that told him, How knowest thou that Saul and Jonathan his son be dead?

Bible References

How knowest

Proverbs 14:15
The simple man has faith in every word, but the man of good sense gives thought to his footsteps.
Proverbs 25:2
It is the glory of God to keep a thing secret: but the glory of kings is to have it searched out.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain