New Revised Standard Version
Then David asked the young man who was reporting to him, “How do you know that Saul and his son Jonathan died?”

Contemporary English Version
David asked, "How do you know Saul and Jonathan are dead?"

New American Bible
Then David said to the youth who was reporting to him, “How do you know that Saul and his son Jonathan are dead?”

Douay-Rheims Bible
And David said to the young man that told him: How knowest thou that Saul and Jonathan his son, are dead?

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

How knowest

Proverbs 14:15 The innocent believeth every word: the discreet man considereth his steps. No good shall come to the deceitful son: but the wise servant shall prosper in his dealings, and his way shall be made straight.

Proverbs 25:2 It is the glory of God to conceal the word, and the glory of kings to search out the speech.