William Burkitt on Matthew 26:6

This woman, St. John says, was Mary, the sister of Lazarus, who, to show her love to Christ, and put honour upon him, took a precious box of ointment, and poured it upon our Saviour's head, according to the custom of the eastern country, who used so to do at their feasts and banquets; to which David alludes, Ps 23:5.

Learn hence, 1. That where true love to Christ prevails in the heart, nothing is adjudged too dear for Christ. This box of ointment murmuring Judas valued at three hundred pence which, reckoning the Roman penny at seven pence halfpenny, makes of our money nine pounds seven shillings and sixpence. Love (we see) spares for no cost but where the esteem of Christ is high, the affection will be strong.

Note, 2. That where strong love prevails towards Jesus Christ, will piously strive with the greatest apostle to express the fervour of her love unto him. I do not find any of the apostles at so much cost to put honour upon Christ, as this poor woman was at. Love knows no bounds, no measures.