וְהַנַּ֖עַר לֹֽא־יָדַ֣ע מְא֑וּמָה אַ֤ךְ יְהֽוֹנָתָן֙ וְדָוִ֔ד יָדְע֖וּ אֶת־הַדָּבָֽר׃
But the lad knew not any thing; only Jonathan and David knew the matter.
Read kabbalistic (mystical) interpretation of I Samuel 20:39: and classical mystical sources.