wheresoever this Gospel shall be preached in the whole world. The Syriac version reads it,
סברתי,
"my Gospel"; and so the Persic version "

Barne's Notes on the New Testament
Verse 13
Verily I say unto you, Wheresoever this gospel shall be preached in the whole world, that also which this woman hath done shall be spoken of for a memorial of her.
Who but God (in Christ) could have had such thoughts and made such promises as contained in these words? Condemned though he stood by the rulers of his people, betrayed by a friend, and facing shame upon the cross, the Saviour, far from being intimidated by such realities, was thinking of the sweeping triumph of the gospel "in the whole world"! His prophecy of the world-wide honor that should accrue to the name of Mary in perpetuity showed how completely his mind was focused upon the impending victory he would achieve upon the cross. The Lord during those dark hours saw not the shame, the agony, or horror of death, but the universal victory of the true and the everlasting glory of them who would love and appreciate it. "Who for the joy that was set before him endured the cross, despising the shame, and hath sat down at the right hand of the throne of God" (Hebrews 12:2). Neither Mark nor Matthew mentioned Mary's name, notwithstanding Jesus' promise. Plummer said:
The reason may be that when they wrote, she was still alive, and would not desire to have her name published. When Luke and John (John 12:2-8) wrote, she may have been deceased. F4
This is another fruitful example that what is given to Christ is saved; all else is lost. Of the lifetime earnings and estate of Mary of Bethany, if the sum total of it had been invested in any conceivable way and multiplied a thousandfold, it would have been powerless to achieve for her name even a fraction of the endowment provided by the 300 pence worth of spikenard lavished upon the body of our Lord