A.T. Robertson Commentary Matthew 27:5

"And he cast down the pieces of silver into the sanctuary, and departed; and he went away and hanged himself." — Matthew 27:5 (ASV)

Hanged himself (απηγξατο). Direct middle. His act was sudden after he hurled the money into the sanctuary (εις τον ναον), the sacred enclosure where the priests were. The motives of Judas in the betrayal were mixed as is usually the case with criminals. The money cut a small figure with him save as an expression of contempt as the current price of a slave.