κυριε τις επιστευσεν τη ακοη ημων

This is a literal quote from the Septuagint, word for word. Isaiah 53 "Lord, who hath believed our report?"
https://www.ellopos.net/elpenor/greek-texts/septuagint/chapter.asp?book=43&page=53

"because the Lord spoke to those of us with faith who heard." is a very unique translation from the Greek text quoting Isaiah 53:1

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