וַיִּשָּׁבַ֨ע ע֜וֹד דָּוִ֗ד וַיֹּ֙אמֶר֙ יָדֹ֨עַ יָדַ֜ע אָבִ֗יךָ כִּֽי־מָצָ֤אתִי חֵן֙ בְּעֵינֶ֔יךָ וַיֹּ֛אמֶר אַל־יֵֽדַע־זֹ֥את יְהוֹנָתָ֖ן פֶּן־יֵֽעָצֵ֑ב וְאוּלָ֗ם חַי־יְהוָה֙ וְחֵ֣י נַפְשֶׁ֔ךָ כִּ֣י כְפֶ֔שַׂע בֵּינִ֖י וּבֵ֥ין הַמָּֽוֶת׃
And David swore moreover, and said: ‘Thy father knoweth well that I have found favour in thine eyes; and he saith: Let not Jonathan know this, lest he be grieved; but truly as the LORD liveth, and as thy soul liveth, there is but a step between me and death.’
Read the Targum (classical Aramaic translation) of I Samuel 20:3: Targum Onkelos and other Aramaic renditions, free online, no signup.