“And, behold, thy cousin Elisabeth, she hath also conceived a son in her old age: and this is the sixth month with her, who was called barren.”
King James Version (KJV)
1:36 And behold, thy cousin Elisabeth - Though Elisabeth was of the house of Aaron, and Mary of the house of David, by the fathers side, they might be related by their mothers. For the law only forbad heiresses marrying into another tribe. And so other persons continually intermarried; particularly the families of David and of Levi.