John Lightfoot on John 11:2

[It was that Mary which anointed, &c.] That is, which had anointed the Lord formerly. For,

I. It is fit the Aorist should have its full force. Whoever will not grant this, let him give a reason why Bethany, which was Lazarus' town, should not be called by his name; but by the name of Mary and her sister Martha. Was it not because those names had been already well known in the foregoing story, whereas till now there had not been one word mentioned of their brother Lazarus? So that anointed respects a noted story that was past, viz. that which is related Luke 7:37.

II. There can be no reason given why the evangelist should say this proleptically, as if he had respect to that passage in chapter 12:3, when he was to relate that story so soon after this. But there may be a sufficient one given why it should have relation to an anointing that had been formerly done: and that is, that it might appear how that familiarity arose betwixt Christ and the family of Lazarus, so far that they could so confidently send for Jesus when Lazarus was sick: for Mary, Lazarus' sister, had some time before anointed his feet.