נְאֻם֙ אֲדֹנָ֣י יְהוִ֔ה מְקַבֵּ֖ץ נִדְחֵ֣י יִשְׂרָאֵ֑ל ע֛וֹד אֲקַבֵּ֥ץ עָלָ֖יו לְנִקְבָּצָֽיו׃
Saith the Lord GOD who gathereth the dispersed of Israel: Yet I will gather others to him, beside those of him that are gathered.
Read Kabbalistic (mystical) interpretations of Isaiah 56:8: Zohar and classical Jewish mystical sources, free online.