John Lightfoot on Luke 2:35

[Yea, and a sword shall pierce through thine own soul also.] Thy soul, i.e. thy life. It is a prediction that the blessed Virgin should suffer martyrdom: "This child of thine shall be set for a sign, which shall be spoken against; neither shalt thou escape in the contradiction that shall be given him, for thou shalt die by the sword." Epiphanius gives some countenance to this exposition.

"Whether the holy Virgin died and was buried, her death was crowned with infinite honour; she made a most chaste end, and the crown of her virginity was given her: or whether she was put to death (as is written, 'A sword shall pass through thine own soul'), she is possessed of glory and a crown amongst the martyrs."