וְנִשְׁאַר־בּ֤וֹ עֽוֹלֵלֹת֙ כְּנֹ֣קֶף זַ֔יִת שְׁנַ֧יִם שְׁלֹשָׁ֛ה גַּרְגְּרִ֖ים בְּרֹ֣אשׁ אָמִ֑יר אַרְבָּעָ֣ה חֲמִשָּׁ֗ה בִּסְעִפֶ֙יהָ֙ פֹּֽרִיָּ֔ה נְאֻם־יְהוָ֖ה אֱלֹהֵ֥י יִשְׂרָאֵֽל׃ (ס)
Yet there shall be left therein gleanings, As at the beating of an olive-tree, Two or three berries In the top of the uppermost bough, Four or five in the branches of the fruitful tree, Saith the LORD, the God of Israel.
Read kabbalistic (mystical) interpretation of Isaiah 17:6: and classical mystical sources.