No, it would not be mandatory for the Messiah to have Rh-negative blood.
From both sacred scripture and scientific biology, there is no requirement linking messianic prophecies to specific blood types or Rhesus (Rh) factors.
1. Sacred Texts & Prophetic Criteria
Neither the Hebrew Bible (Old Testament) nor the New Testament mentions blood types, Rh factors, or cellular biology, as modern hematology was discovered millennia after these texts were written.
Jewish Prophetic Requirements: In traditional Judaism, the criteria for the Messiah (Mashiach) center around earthly actions and lineage—specifically, being a direct male descendant of King David through his son Solomon, restoring the Jewish people to Israel, rebuilding the Temple, and ushering in an era of global peace. Biological traits like blood group are completely absent from these requirements. 
Christian Prophetic Requirements: In Christian theology, Jesus of Nazareth is recognized as the Messiah through fulfilling Old Testament prophecies regarding his birth, Davidic ancestry, suffering, death, and resurrection. Salvation and messianic identity are rooted in spiritual obedience and divine covenant, not specific blood chemistry.
2. Historical & Cultural Context
The concept of Rh-negative blood is a modern biological classification discovered by Karl Landsteiner and Alexander S. Wiener in 1940. Ancient Middle Eastern populations, including historical Judean communities, possessed standard human blood variations (Types A, B, AB, and O, with both Rh+ and Rh- factors present in the general pool).
3. Origin of the Rh-Negative Messiah Myths
Speculations linking Rh-negative blood to the Messiah generally stem from non-biblical modern subcultures, esoteric theories, and popular media rather than theology:
The Shroud of Turin Speculation: Serological tests conducted on relics like the Shroud of Turin and the Sudarium of Oviedo identified traces of human AB blood. While a few non-peer-reviewed authors have speculated about the Rh factor (some claiming AB+ and others AB-), mainstream science notes that ancient degraded blood samples often show degradation artifacts that mimic AB reactions, and scripture assigns no theological weight to the result regardless.
Alternative Bloodline Myths: Modern Internet theories often associate Rh-negative blood with “royal bloodlines,” “ancient extra-terrestrials,” or unique spiritual status. These claims are entirely unscientific and lack any backing from mainstream biblical scholarship, history, or genetics.
The credentials of the Messiah are defined purely by prophetic fulfillment, lineage, and spiritual mission—not by Rh factors or red blood cell antigens.(AI)