Matthew 27:8 explains that the field purchased with the money returned by Judas was called "The field of blood" and that this name was still used at the time the Gospel was written. The verse highlights the lasting association of this place with the events surrounding Jesus’ betrayal and Judas’s actions.
Matthew is narrating to his readers, describing how the field became known by this name because it was bought with the money Judas received for betraying Jesus. The phrase "unto this day" shows that the memory and significance of this event were still present in the community long after it happened, marking the field as a reminder of the betrayal.