וָאֶשְׁמַ֞ע אֶת־ק֤וֹל אֲדֹנָי֙ אֹמֵ֔ר אֶת־מִ֥י אֶשְׁלַ֖ח וּמִ֣י יֵֽלֶךְ־לָ֑נוּ וָאֹמַ֖ר הִנְנִ֥י שְׁלָחֵֽנִי׃
And I heard the voice of the Lord, saying: Whom shall I send, And who will go for us? Then I said: ‘Here am I; send me.’
Read kabbalistic (mystical) interpretation of Isaiah 6:8: and classical mystical sources.