Theophylact of Ohrid

Then our Lord reproves His disciples, for throwing obstacles against the wish of the woman. Wherefore it goes on: And Jesus said, Let her alone, why trouble ye her? For after she had brought her gift, they wished to prevent her purpose by their reproaches.

Catena Aurea by Aquinas ↗

Jerome

When the apostles pleaded that the ointment was being wasted, they were rebuked by the voice of the Lord. Christ did not need the ointment, nor do martyrs need the light of candles. Yet that woman freely poured out the ointment in honor of Christ, and her heart's devotion was accepted.… Hence throughout the whole Eastern Church, even when there are no relics of the martyrs, whenever the gospel is to be read the candles are lighted although the dawn may be reddening the sky, not of course to scatter the darkness, but by way of …

Against Vigilantius 7 ↗

Bede

But Jesus said, "Leave her alone. Why do you trouble her? She has done a good deed to me. For you always have the poor with you, and whenever you want, you can do good to them; but you will not always have me." Another question arises, why did Jesus say after the resurrection to the disciples, "Behold, I am with you always, to the end of the age" (Matthew 28), and now says, "But you will not always have me." But it seems to me in this place he speaks of his bodily presence: because he will not be with them after the resurrection as …

On the Gospel of Mark ↗