Exodus 4:6 Commentary: The Leprous Hand, God's Power over Life and Death

In the ancient Near East, leprosy was more than a disease, it was a living death. The Hebrew term tsara'at covered various skin conditions, but the "white as snow" description points to the advanced form that covered the whole body with white scales. Adam Clarke cites a case where "the skin was shining as if covered with snow." Such a condition meant immediate expulsion from the camp and lifelong isolation. The Jewish historian Josephus reports that leprosy was considered a punishment from God, and the story of Naaman (2 Kings 5) confirms that even foreign kings believed only a deity could cure it.

This cultural backdrop explains why God chose this sign. When Moses put his hand into his cheq (bosom), the fold of his outer garment, as Jamieson-Fausset-Brown describes, he withdrew it not just diseased, but ritually and socially dead. The instantaneous restoration (v. 7) was equally powerful. The restoration did not require a priestly quarantine, an offering, or a waiting period. God simply reversed the condition by His command.

The sign is the second in a triad, and each sign addresses a different arena of doubt. The staff becoming a serpent spoke to God's power over the enemy (Egypt). The leprous hand spoke to God's power over the human condition itself, the corruption and death that plague God's people from within. Calvin sees here a reference to Moses' own history: forty years exiled in Midian, "one half-dead," now to be restored. Keil and Delitzsch note that these signs also strengthened Moses' faith. By putting his own hand into his cloak, Moses felt the reality of divine judgment and mercy on his own skin. For an audience that knew leprosy's terror, this sign announced that the God who brings low can also raise up, and that He alone holds the keys to life and death.

The consulted sources note no significant textual variants for Exodus 4:6. The Hebrew text is consistent across major manuscripts and versions. The Targums (Onkelos and Jonathan) paraphrase "white as snow" but do not reflect a different underlying text. All major English translations agree on the wording of the verse.

Christian tradition has often interpreted the sign of the leprous hand as a symbol of the human condition that only God can cleanse. Early church writers read it as a type of the incarnation: the hand hidden in the bosom represented the hiddenness of Christ's divine nature, and the leprosy signified the sin He took on and healed. In the Reformation, Calvin gave the sign a personal devotional reading, seeing in it a lesson for Moses about his own restoration from obscurity. Wesley applied it directly to Israel's spiritual pollution and God's cleansing power. The sign has also been used in homiletic tradition to illustrate the suddenness of divine judgment and the completeness of divine restoration.

Three-point outline

1. What is hidden comes to light. Moses put his hand into his cloak, a place of concealment. When he withdrew it, the disease was fully visible. God exposes what we cannot see, whether sin, weakness, or the need for His power.
2. Only God can cure the incurable. Leprosy was considered beyond human remedy. The same hand that became diseased was restored instantly at God's command. The sign announces that nothing is beyond His authority, not even death.
3. God equips whom He sends. This sign was given to authenticate Moses before Israel. It gave Moses confidence that the One who sent him could change any situation. The sign was not for Moses alone but for the people who would witness it.

Five-point outline

1. Personal involvement. Unlike the staff or the river, this sign touched Moses' own body. He could not distance himself from it. God's power works through the messenger's own vulnerability.
2. Disease as divine territory. In the ancient world, leprosy was seen as inflicted only by the gods. By using it, God claims exclusive authority over what others consider untouchable.
3. Instant change. The leprosy appeared "as white as snow" immediately. No gradual onset, no natural explanation. The speed underscores supernatural intervention.
4. Complete reversal. In verse 7, the hand "turned again as his other flesh." No trace of the disease remained. God does not patch up; He restores.
5. Faith for the journey. The signs were given because Moses struggled to believe the people would believe (v.1). God meets our unbelief with tangible evidence of His power.

Illustration hooks

• A routine medical scan reveals something the patient never felt. The hidden condition becomes visible, and only then can treatment begin. This sign works the same way: what was hidden is brought into the light.
• A termite infestation discovered during home renovation. The damage was serious, but hidden behind walls. After discovery, the homeowner must trust an expert to fix what they cannot fix themselves.
• A gifted speaker who, when asked to speak publicly, suddenly feels their voice fail. The weakness becomes the very place where God's strength is demonstrated.

Questions your congregation is asking

• Does God still give signs like this today? While the apostolic signs were unique to the foundation of God's work in history, we can still ask God to confirm His direction through Scripture, circumstances, and the counsel of other believers.
• If leprosy represents sin, does this mean God makes people sick as a lesson? The sign was not a punishment for Moses; it was a display of God's power. Christians have recognized that not all sickness is direct punishment, though all human suffering is connected to life in a fallen world.
• What does it mean that the hand was in the bosom? The bosom was a hidden, intimate place. This sign suggests that God sees what is hidden in human hearts, and that He alone can cleanse it.

This sign strikes close to home. Unlike the staff that Moses held at arm's length, the leprous hand touched his own body. The disease that isolated people from community and worship became the very thing God used to authenticate His messenger. As you discuss this passage, consider how God works through vulnerability and seeming powerlessness to display His strength.

Discussion questions

1. Read Exodus 4:6-7. What exactly happens in these two verses? Describe the change in Moses' hand, both in verse 6 and verse 7.
2. Why do you think the text emphasizes that the hand was "leprous, as white as snow"? What connotations would leprosy have had for an Israelite audience?
3. God gives Moses three signs. What is different about this sign compared to the staff turning into a snake (vv. 2-4)? Consider how each sign involves Moses differently.
4. In what ways does this sign show God's authority over both judgment and mercy? Adam Clarke notes that the leprosy was considered incurable and divine. What does it mean that God can both inflict and remove it instantly?
5. Calvin suggests that the sign connects to Moses' own forty years in Midian, a period of obscurity and apparent weakness. How might this sign have strengthened Moses for the task ahead?
6. Verse 8 explains that if the people do not believe the first sign, they will believe "the voice of the latter sign." What does this tell us about God's patience with human doubt?
7. Where in your own life are you tempted to see a situation as incurable, whether a relationship, a habit, or a community struggle? How does this sign reshape your view of God's power in that area?