2 Samuel 1:5

David asked the young man who related the story, "How do you know that Saul and his son Jonathan are dead?"

Proverbs 14:15

An unthinking person believes everything, but the prudent one thinks before acting.

Proverbs 25:2

It is the glory of God to conceal a matter, and the glory of kings to investigate 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
An unthinking person believes everything, but the prudent one thinks before acting.
Proverbs 25:2
It is the glory of God to conceal a matter, and the glory of kings to investigate a matter.

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