John 12:3-6

Then Mary took about a pint [about 0.5 liter] of pure nard, an expensive perfume; she poured it on Jesus' feet and wiped his feet with her hair. And the house was filled with the fragrance of the perfume. But one of his disciples, Judas Iscariot, who was later to betray him, objected, "Why wasn't this perfume sold and the money given to the poor? It was worth a year's wages [300 denarii]." He did not say this because he cared about the poor but because he was a thief; as keeper of the money bag, he used to help himself to what was put into it.

about a pint of pure nard, an expensive perfume 
Mark 14:3  While he was in Bethany, reclining at the table in the home of Simon the Leper, a woman came in with an alabaster jar of very expensive perfume, made of pure nard. She broke the jar and poured the perfume on his head. 

she poured it on Jesus' feet and wiped his feet with her hair 
John 11:2  (This Mary, whose brother Lazarus now lay sick, was the same one who poured perfume on the Lord and wiped his feet with her hair.)

Judas Iscariot, who was later to betray him 
Matthew 10:4  ... Simon the Zealot and Judas Iscariot, who betrayed him.
Matthew 26:14-16  Then one of the Twelve--the one called Judas Iscariot--went to the chief priests and asked, "What are you willing to give me if I deliver him over to you?" So they counted out for him thirty pieces of silver. From then on Judas watched for an opportunity to hand him over.
Matthew 26:47  When Judas, who had betrayed him, saw that Jesus was condemned, he was seized with remorse and returned the thirty pieces of silver to the chief priests and the elders.
John 13:2  The evening meal was in progress, and the devil had already prompted Judas, the son of Simon Iscariot, to betray Jesus.
John 13:26-27  Jesus answered, "It is the one to whom I will give this piece of bread when I have dipped it in the dish." Then, dipping the piece of bread, he gave it to Judas, the son of Simon Iscariot. As soon as Judas took the bread, Satan entered into him. So Jesus told him, "What you are about to do, do quickly."

[brackets are mine]

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