בַּיּ֣וֹם הַה֔וּא יִשְׁעֶ֥ה הָאָדָ֖ם עַל־עֹשֵׂ֑הוּ וְעֵינָ֕יו אֶל־קְד֥וֹשׁ יִשְׂרָאֵ֖ל תִּרְאֶֽינָה׃
In that day shall a man regard his Maker, And his eyes shall look to the Holy One of Israel.
Read halakhic rulings (Jewish law) on Isaiah 17:7: and classical halakhic sources.