Matthew 10:4

Simon the Canaanite] RV 'the Cananæan,' RM 'the zealot.' 'The Zealots were a sect founded by Judas of Gamala (or of Galilee, Acts 5:37), who headed the opposition to the census of Quirinius 6 or 7 a.d. They bitterly resented the domination of Rome, and would fain have hastened with the sword the fulfilment of the Messianic hope. During the great rebellion and the siege of Jerusalem their fanaticism made them terrible opponents, not only to the Romans, but to other factions among their own countrymen' (HDB.).

Judas Iscariot] Both Judas and his father Simon were called Iscariot, lit. 'man of Kerioth,' because they were natives of Kerioth, a village of S. Judah, near Hebron (John 15:25). He was the only Judæan apostle: see Matthew 26:14; Matthew 26:25; Matthew 26:47; Matthew 27:3; Luke 22:3; John 6:71; John 12:4; John 13:2; John 13:26; John 13:29; John 18:2; Acts 1:16; Acts 1:25.