הֵ֣ן גּ֤וֹי לֹֽא־תֵדַע֙ תִּקְרָ֔א וְג֥וֹי לֹֽא־יְדָע֖וּךָ אֵלֶ֣יךָ יָר֑וּצוּ לְמַ֙עַן֙ יְהוָ֣ה אֱלֹהֶ֔יךָ וְלִקְד֥וֹשׁ יִשְׂרָאֵ֖ל כִּ֥י פֵאֲרָֽךְ׃ (ס)
Behold, thou shalt call a nation that thou knowest not, And a nation that knew not thee shall run unto thee; Because of the LORD thy God, And for the Holy One of Israel, for He hath glorified thee.
Read halakhic rulings (Jewish law) on Isaiah 55:5: and classical halakhic sources.