“And behold, thy cousin Elizabeth, she hath also conceiued a sonne in her old age, and this is the sixt moneth with her, who was called barren.”
1611 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.