וְאַל־יֹאמַ֣ר בֶּן־הַנֵּכָ֗ר הַנִּלְוָ֤ה אֶל־יְהוָה֙ לֵאמֹ֔ר הַבְדֵּ֧ל יַבְדִּילַ֛נִי יְהוָ֖ה מֵעַ֣ל עַמּ֑וֹ וְאַל־יֹאמַר֙ הַסָּרִ֔יס הֵ֥ן אֲנִ֖י עֵ֥ץ יָבֵֽשׁ׃ (ס)
Neither let the alien, That hath joined himself to the LORD, speak, saying: ‘The LORD will surely separate me from His people’; Neither let the eunuch say: ‘Behold, I am a dry tree.’
Read kabbalistic (mystical) interpretation of Isaiah 56:3: and classical mystical sources.