John Gill Commentary John 11:2

"And it was that Mary who anointed the Lord with ointment, and wiped his feet with her hair, whose brother Lazarus was sick." — John 11:2 (ASV)

It was [that] Mary which anointed the Lord with ointment ,
&c.] Not the woman in (Luke 7:37), as some have thought, whose name is not mentioned, and which history is not related by John at all: but Mary in (John 12:3), who is both mentioned by name, and along with Lazarus her brother, and with whom all the circumstances of the affair suit; and though the fact was not yet done, yet John writing many years after it was done, and when it was well known, proleptically, and in a parenthesis, takes notice of it here.

and wiped his feet with her hair ;
instead of a napkin, after she had anointed them with oil; (See Gill on Luke 7:37), (See Gill on John 12:3).

Whose brother Lazarus was sick ;
this is observed, to show how well they were all acquainted with Christ, and affected to him.