We spell Mardocheus as Mordecai. Robert is referring to the Book of Esther. If read, the citation below spades a clump of Old Testament literary forms. I shocked a Catholic by mentioning literary forms. “No, it’s the word of God.” Be smarter.
“Although the Book of Esther was questioned by some early Christians, even St. Jerome, the whole book, including the Greek additions, was included in the canon of Scripture by the Council of Trent.”
https://bible.usccb.org/bible/esther/0