What is "the forgiveness of Jesus" that was allegedly present in Jerusalem upon its conquest by Muslims, along with the staff of Moses and the ring of Solomon?

It has not been reported in any authentic or weak narration that Muslims, upon conquering Jerusalem, will find the staff of Moses and the ring of Solomon. Furthermore, there is no indication of the existence of "the forgiveness of Jesus" in the sense mentioned, as the linguistic meanings of "ghafr" (forgiveness) do not suggest this.