Reference for Psalms 107:10

יֹ֭שְׁבֵי חֹ֣שֶׁךְ וְצַלְמָ֑וֶת אֲסִירֵ֖י עֳנִ֣י וּבַרְזֶֽל׃

Such as sat in darkness and in the shadow of death, Being bound in affliction and iron—

ספר השרשים