Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 6
But thou, when thou fastest, anoint thine head, and wash thy face; That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which seeth in secret, shall reward thee openly.
Spiritually again, thy head denotes Christ. Give the thirsty drink and feed the hungry, and therein you have anointed your head, that is, Christ, who cries out in the Gospel, In that ye have done this to one of the least of these my brethren, ye have done it to me. (Mat. 25:40.)