John Dummelow's Commentary on the Bible - John 12:1-50
The Triumphal Entry. Close of the Public Ministry1-11. Supper at Bethany (see on Matthew 26:6 and Mark 14:3, which record the same incident). The event in Luke 7:36. is different. The supper was at the house of Simon the leper, a near relation, perhaps the father, of Lazarus and the sisters. St. John alone mentions the name of the woman who anointed Jesus, the quantity of the unguent (1 litre = 12 oz.), and the author of the mean speech, ’Why was not this ointment sold for three hundred pence,... read more
Expository Notes of Dr. Thomas Constable - John 12:6
John knew Judas’ real motive for objecting (cf. John 10:13). Judas’ selfish materialism helps us understand why He was willing to betray Jesus for 30 pieces of silver."His remonstrance over the gift of the ointment revealed that he had a sharp sense of financial values and no appreciation of human values." [Note: Tenney, "John," p. 125.] Evidently the other disciples learned of their treasurer’s larcenous behavior after He betrayed Jesus. read more