Augustine of Hippo — as excerpted in the Catena Aurea on Mark 14:3-9

“(de Con. Evan. ii. 79) I however think that nothing else can be meant, but that the sinner who then came to the feet of Jesus was no other than the same Mary who did this twice; once, as Luke relates it, when coming for the first time with humility and tears she merited the remission of her sins. For John also relates this, when he began to speak of the raising of Lazarus before He came to Bethany, saying, It was that Mary which anointed the Lord with ointment, and wiped his feet with her hair, whose brother Lazarus was sick. (John 11:2) But what she again did at Bethany is another act, unrecorded by Luke, but mentioned in the same way by the other three Evangelists. In that therefore Matthew and Mark say that the head of the Lord was anointed by the woman, whilst John says the feet, we must understand that both the head and the feet were anointed by the woman. Unless because Mark has said that she broke the box in order to anoint His head, any one is so fond of cavilling as to deny that, because the box was broken, any could remain to anoint the feet of the Lord. But a man of a more pious spirit will contend that it was not broken so as to pour out the whole, or else that the feet were anointed before it was broken, so that there remained in the unbroken box enough to anoint the head.”