John Lightfoot on Matthew 26:12

[She did it for my burial.] She had anointed his feet, John 12:3, out of love, duty, and honour to him; but this (which is added over and above to them) is upon account of his burial; and that not only in the interpretation of Christ, but in the design of the woman. She, and she first, believes that Christ should die; and, under that notion, she pours the ointment upon his head, as if she were now taking care of his body, and anointing it for burial: and it is as if Christ had said to those that took exceptions and complained, "You account her too officious and diligent for her doing this; and wasteful rather than prudent, in the immoderate profession of her friendship and respect; but a great and weighty reason moves her to it. She knows I shall die, and now takes care of my burial: what you approve of towards the dead, she hath done to one ready to die. Hence her fame shall be celebrated, in all ages, for this her faith, and this expression of it."