וְשִׁלַּשְׁתָּ֙ תֵּרֵ֣ד מְאֹ֔ד וּבָאתָ֙ אֶל־הַמָּק֔וֹם אֲשֶׁר־נִסְתַּ֥רְתָּ שָּׁ֖ם בְּי֣וֹם הַֽמַּעֲשֶׂ֑ה וְיָ֣שַׁבְתָּ֔ אֵ֖צֶל הָאֶ֥בֶן הָאָֽזֶל׃
And in the third day thou shalt hide thyself well, and come to the place where thou didst hide thyself in the day of work, and shalt remain by the stone Ezel.
Read kabbalistic (mystical) interpretation of I Samuel 20:19: and classical mystical sources.