2 Samuel 1:5

And David said to the young man who told him, How do you know that Saul and his son Jonathan are dead?

Proverbs 14:15

The simple believes every word, but the wise man watches his step.

Proverbs 25:2

The glory of God is to hide a thing; but the honor of kings is to search out a matter.

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 believes every word, but the wise man watches his step.
Proverbs 25:2
The glory of God is to hide a thing; but the honor of kings is to search out a matter.