Shared ground
Samuel makes a confident call based on what he can see: Eliab looks like the right kind of king. The text presents this as a real mistake, not just incomplete information. God directly corrects Samuel and gives a stated reason for the correction.
The passage explicitly contrasts two kinds of evaluation. Humans naturally assess what is outward and noticeable (face, height, overall presence). God’s evaluation goes deeper, described as looking at “the heart.”
God’s words also include a clear verdict about Eliab: “I have rejected him.” In the story’s logic, the choice has already been settled from God’s side, even though Samuel is still in the process of looking.
Where interpretation differs
What “heart” means. Many readers take “heart” to mean moral character and integrity. Others take it more broadly as a person’s inner life—motives, loyalty, intentions, and direction—without claiming the text is saying Eliab is morally corrupt. Both readings agree that God’s focus is not limited to outward traits.
What “rejected” refers to. Some read the rejection narrowly: Eliab is not God’s pick for kingship. Others hear a wider disapproval of Eliab as a person. The immediate context in this scene (identifying “Yahweh’s anointed”) favors the narrower claim, though the text does not spell out the full reasons.
Why the disagreement exists
The story gives a principle (“humans look outward; Yahweh looks at the heart”) but does not define “heart” in detail. Likewise, “rejected” is stated without explanation of whether the rejection is role-specific or personal. Those gaps leave room for different, but passage-connected, inferences.
What this passage clearly contributes
It establishes a narrative rule for the king-search: visible impressiveness is not a reliable guide to God’s choice. It also shows that even an experienced leader can misread a situation when using normal human criteria. The passage adds an important claim about God: God’s assessment is internal and discerning in a way human sight is not, and God’s decision overrules confident first impressions (cf. 1 Samuel 16:6–7).