וַיִּכְרְת֧וּ שְׁנֵיהֶ֛ם בְּרִ֖ית לִפְנֵ֣י יְהוָ֑ה וַיֵּ֤שֶׁב דָּוִד֙ בַּחֹ֔רְשָׁה וִיהוֹנָתָ֖ן הָלַ֥ךְ לְבֵיתֽוֹ׃ (ס)
And they two made a covenant before the LORD; and David abode in the wood, and Jonathan went to his house.
Read kabbalistic (mystical) interpretation of I Samuel 23:18: and classical mystical sources.