Bede the Venerable

No history tells us that Mary departed this life by being slain with the sword, therefore since not the soul but the body is killed with iron, we are left to understand that sword which is mentioned, And a sword in their lips, (Ps. 59:7.) that is, grief because of our Lord’s passion passed through her soul, who although she saw Christ the very Son of God die a voluntary death, and doubted not that He who was begotten of her flesh would overcome death, could not without grief see Him crucified.