וַתָּשֻׁ֤רִי לַמֶּ֙לֶךְ֙ בַּשֶּׁ֔מֶן וַתַּרְבִּ֖י רִקֻּחָ֑יִךְ וַתְּשַׁלְּחִ֤י צִרַ֙יִךְ֙ עַד־מֵ֣רָחֹ֔ק וַתַּשְׁפִּ֖ילִי עַד־שְׁאֽוֹל׃
And thou wentest to the king with ointment, And didst increase thy perfumes, And didst send thine ambassadors far off, Even down to the nether-world.
Read halakhic rulings (Jewish law) on Isaiah 57:9: and classical halakhic sources.