Exodus 17 · a question people ask
Why did the battle turn on whether Moses' hand was up?
The text says what happened: "When Moses held up his hand, Israel prevailed. When he let down his hand, Amalek prevailed" (17:11). It doesn't say how the two were linked. Christians agree that the victory didn't rest on Moses' own strength: his hands grew heavy and had to be held up (17:12), and he named the altar "The LORD our Banner" (17:15). They read the raised hand in two main ways.
How Christians read it
Where Christians differ, Favor sets out the main views side by side and doesn't pick one.
Hands raised to God
Those who hold this view read the raised hands as Moses calling on the LORD. Moses told Pharaoh, "I will spread out my hands to the LORD" (9:29), and when he did, the thunder and hail stopped (9:33). Paul writes of people who "pray, lifting up holy hands" (1 Timothy 2:8). On this reading, the battle below depended on the LORD, whom Moses was looking to on the hill.
Exodus 9:29 · Exodus 9:33 · 1 Timothy 2:8
God's rod lifted up
Those who hold this view note what Moses said he would hold: "Tomorrow I will stand on the top of the hill with God’s rod in my hand" (17:9). Exodus has lifted a rod before, over the Nile (7:20) and over the sea: "Lift up your rod, and stretch out your hand over the sea and divide it" (14:16). On this reading, the lifted rod was the sign that the LORD's power was at work, as in Egypt and at the sea.
Exodus 17:9 · Exodus 7:20 · Exodus 14:16
The verses
“Moses said to Joshua, “Choose men for us, and go out to fight with Amalek. Tomorrow I will stand on the top of the hill with God’s rod in my hand.””
“When Moses held up his hand, Israel prevailed. When he let down his hand, Amalek prevailed. But Moses’ hands were heavy; so they took a stone, and put it under him, and he sat on it. Aaron and Hur held up his hands, the one on the one side, and the other on the other side. His hands were steady until sunset.”
“Moses built an altar, and called its name “The LORD our Banner”.”