Shared ground
Luke presents this wilderness scene as the immediate follow-up to Jesus’s public moment at the Jordan. Jesus is described as “full of the Holy Spirit” and “led by the Spirit” into an isolated place. The testing is not pictured as random misfortune; it happens within the setting the Spirit leads him into.
The testing is connected to real bodily need. Jesus eats nothing during the forty days, and Luke highlights the plain result: “he was hungry.” The devil’s first spoken challenge targets that hunger and ties it to identity: “If you are the Son of God, command this stone to become bread.” Jesus refuses by citing Scripture (from Deuteronomy), placing human life under God’s word, not food alone (Deuteronomy 8:3).
Where interpretation differs (only where needed)
One question is timing: does “being tempted for forty days” mean ongoing testing throughout the whole period, with the bread challenge coming at the end, or does Luke mainly mean the decisive temptations occur when the forty days finish and hunger peaks? Both readings take Luke’s wording seriously; they differ on whether the dialogue is a snapshot of a larger struggle or the main event.
Another question is what “If you are the Son of God” is doing. Some read it as an attempt to provoke doubt about Jesus’s identity. Others read it more as a challenge to prove identity by using power in a self-serving way.
A third question is what counts as “every word of God” in Jesus’s reply. Some understand it broadly as God’s ongoing direction and provision, not limited to a written text. Others read it more narrowly as God’s commands/promises as given in Scripture, emphasizing that Scripture sets the boundaries for action.
Why the disagreement exists
Luke’s wording can carry more than one emphasis without changing the basic storyline. “For forty days, being tempted” can describe duration and also set up a climax. “If you are…” can express either doubt or a provocation to misuse status. And the Deuteronomy citation naturally raises the question of whether “word” means God’s spoken guidance, Scripture as written, or both.
What this passage clearly contributes
Explicitly, Luke shows Jesus entering testing while led by the Spirit, experiencing real hunger, and meeting the devil’s challenge without turning stones to bread. Jesus’s stated reason is grounded in Scripture: human life cannot be reduced to food, because life is also under God’s word.
By implication (but not as a separate explicit claim), Luke frames Jesus’s identity and mission as including restraint: being “Son of God” does not mean using power to satisfy immediate appetite on demand, especially at the devil’s prompting. The scene also links Jesus to Israel’s wilderness story by using the Deuteronomy line about hunger and dependence on God.