God’s Word for You
Genesis 4:6-7 sin crouching at your door
by Pastor Timothy Smith on Thursday, October 1, 2026
6 Then the LORD said to Cain, “Why are you angry? Why is your face downcast? 7 If you do what is good, will you not be accepted? But if you do not do what is good, sin is crouching at your door; it desires to have you, but you must master it.”
Cain was probably feeling embarrassed, since his offering was so clearly rejected by God in front of everyone who was there at the ceremony. He was not only angry because his offering was rejected, but he was also angry because his brother’s gift had been accepted. But let’s pay close attention to the first phrase in verse 6, “The LORD said to Cain.” This was not a dialogue playing out in Cain’s imagination. And I don’t think that this was Adam coming with God’s words as a prophet—not because this could not have happened, but because it is not what the text says. This was the LORD, the gracious God, who came to his child Cain with a call to repentance.
The Lord’s question, “Why are you angry?” was an opportunity for Cain to see the problem with his anger and to examine the reason for this rejection, which was sin. Had Cain sinned by bringing too meager an offering? No, the text says nothing about that at all, and grain offerings were common in the ancient world and among both pagans and Israelites (Exodus 29:41; Judges 13:19).
Or had Cain sinned by expecting that because he was the firstborn, his offering would be accepted? Some ancient commentators speculated about this, but once again, there is nothing in the text about it.
Had Cain sinned by what he said as he offered this sacrifice? Since we have no record of his words, this is not an issue that the Holy Spirit wants us to consider here.
Therefore, Cain was not so much sinning with his words, but rather with his thoughts. And since no other explanation is offered in Scripture apart from his unbelief, that unbelief must be the sin that God saw. For Abel’s offering was received on account of his faith (Hebrews 11:4), and he “offered a better sacrifice than Cain did.”
John tells us that Cain also sinned in his actions, saying, “His deeds were evil and his brother’s were righteous” (1 John 3:12). In the unrepentant heart, sinful thoughts will lead to sinful words, sinful actions, and still more sinful words and thoughts. “For a man’s ways are in full view of the LORD, and he examines all his paths. The evil deeds of a wicked man ensnare him; the cords of his sin hold him fast. He will die for lack of discipline, led astray by his own great folly” (Proverbs 5:21-23).
God warns Cain. This is the word-picture of sin crouching at the door, desiring to have Cain. In most cases, the verb rabatz means “to lie down.” We see this in Jacob’s words, “Like a lion, Judah crouches and lies down” (Genesis 49:9). But here the word is an active participle, and in the words of my college Hebrew Professor (Prof. Paul Eickmann), the image is that “Sin is crouching down on all fours, ready to pounce on you!”
This moves us to the final part of the text: “You must master it.” Was Cain able to say no to the fast-approaching sin of murder? We must acknowledge that right here in this verse this question is answered: God himself says that Cain had this ability. He was guilty of unbelief, but God was drawing him back to faith through repentance. Then the repentant sinner is able to ask God for help in overcoming a temptation. Like Cain, we sinners live within this world of sin. For “the whole world is a prisoner of sin” (Galatians 3:22). But when we are attacked and pummeled by the temptations of the world and of our own sinful nature, we hear God calling to us in the Gospel to trust in him, to ask him for help, and inviting us to pray to him: “Lead us not into temptation!” And God promises to give us “power and strength to resist, even though the tribulation is not removed or ended” (Large Catechism, Sixth Petition, par. 106). For we should at least know by experience that temptations will keep coming; we cannot escape from them as long as we live. But we pray that we will not fall into them, or be overwhelmed by them. Luther compared temptations with birds: “You cannot prevent the birds from flying over your head, but you can certainly prevent them from building a nest in your hair.”
Temptation comes in two kinds. We can be tempted for our good, and tempted for evil. God tempts or tests his people in order to strengthen our faith and to draw us closer to him. We see this in the account of the Canaanite woman whose daughter was possessed by a demon. Her mother came to Jesus to ask for his help, and he tested her, saying, “It is not right to take the children’s bread and toss it to the dogs” (Matthew 15:26). But she said, “Yes, Lord, but even the dogs eat the crumbs from their master’s table” (15:27), and Jesus told her, “You have great faith!” and healed her daughter. The true believer knows that even the crumbs of Jesus are enough. I know of a woman whose gravestone says (in Latin), “Crumbs, crumbs are enough” in memory of this Gospel account.
But we can be tempted by Satan, who wants us to fall. He wants to destroy our faith (Luke 22:31). Jesus teaches us, “Watch and pray that you may not fall into temptation” (Matthew 26:41). Ask your Savior to help you, and be confident that he will do it. He gives us what we need when we need it. When we fall, he leads us to repent and gives us forgiveness. But if we ask for his help before we fall, he will give us strength. Ask for that strength, to resist.
In Christ,
Pastor Timothy Smith
Pastor Smith serves St. Paul’s Lutheran Church in New Ulm, Minnesota. To receive God’s Word for You via e-mail, please visit the St. Paul’s Lutheran Church website.