But then entered Satan into Judas, named Iscariot, being of the number of the Twelve. And he went his way and communed with the chief priests and captains, that he might betray Him, and said, What will ye give me? I will deliver Him unto you. When they heard it, they were glad. And they covenanted with him for thirty pieces of silver, and he promised. And from that time he sought opportunity to betray Him without rumor.
Matthew 26:13–16; Mark 14:10–11; Luke 22:3–6

O Judas, is this the reward for the faithfulness and benefits that Christ showed thee? For a handful of coins thou sellest the One who is to be prized higher than heaven and earth? Woe to thee! This deed shall be to thy hurt in body and soul!
Here from this terrible deed of Judas’ let every man learn, first, how the devil is such a powerful enemy, who stirs up and drives men to sin, and that “he that committeth sin is of the devil” (1 John 3:8). Therefore we are to resist him, steadfast in the faith. Second, that covetousness is a root of all evil. Behold, Judas lets himself be so taken in by the insatiable devil of covetousness that he betrays his own Lord and Master, who is the Son of God and whose glory he has seen with the other disciples, for thirty pieces of silver. For because the damnable love of money brings great harm, and at the same time ill-gotten goods are kept in a purse full of holes, therefore let every Christian keep himself from this vice, and pray daily with David: O Lord, “incline my heart unto Thy testimonies, and not to covetousness” (Psalm 119:36). Third, let it be learned that many people in the world, out of sheer vainglory and greed for money, hatred and envy, and other in ordinate affects, bring themselves and others into all manner of mischief, sorrow, and misery, and lose their life and limb, yea, even their salvation. For because Judas saw that by the anointing of Christ here, a goodly sum had slipped through his fingers, and that he could not attain to worldly honor and great riches with Christ and His Gospel, he sought every opportunity to be rid of Christ, to take revenge on Him, and to obtain great honor, money, and goods with the chief rulers of Jerusalem. Therefore he offered to betray Christ.

This was a bitter suffering for the Lord Christ. But He left us a pattern, that we should walk in His steps and imitate Him and suffer with patience when we have done all good to others and afterward are betrayed and sold and brought into sorrow and misery by them. Chrysostom, the doctor of the church, the veritable “Goldenmouth,” had with him a deacon by the name of Severianus, a hypocritical babbler, whom he sometimes caused to preach for him and did him every good at the court of Emperor Arcadius. But afterward, the Empress Eudoxia made so much of this abominable hypocrite that he despised his preceptor and finally drove him into exile and misery, in which the holy man died in the year after the death of Arcadius.

But see that the Lord Christ is the true Joseph, who is sold by his own brothers, as Zechariah prophesied (Zech. 11:12–13). He is sold and betrayed for our sake. It cost a great deal to redeem our souls, for God’s only Son Himself is the Ransom, yet He is appraised at only thirty pieces of silver. But it was so resolved that He who was counted as nothing before the world should count a great deal before His heavenly Father, and His death should be a plentiful payment for the sins of the children of men.
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An excerpt from Passion-Book by Friedrich Lochner, edited and translated by Matthew Carver, Devotion 5