Exploring the Meaning of Louo in Greek

λούω means “to wash,” and it appears in scenes ranging from ordinary bodily cleansing to deliberate acts of care and vivid moral imagery. In these passages it is used for washing feet, washing a body, washing wounds, and washing as a concrete picture placed beside inward realities.

Occurrences

Jesus said to him, “Someone who has bathed only needs to have his feet washed, but is completely clean. You are clean, but not all of you.” (John 13:10)

Here washing is framed within a contrast between a full bath and a smaller, needed washing of the feet. The statement assumes that one who “has bathed” is “completely clean,” yet still may “need” the feet to be washed—an ordinary, practical distinction that fits a setting where feet can become dirty again even after bathing. Within the same sentence, the language of being “clean” is repeated and applied to the disciples (“You are clean, but not all of you”), so the action of washing functions as the concrete basis for an evaluation of cleanliness that extends beyond the feet. The verb thus carries the everyday sense of washing while supporting the scene’s contrast between complete cleansing and partial, repeated washing.

In those days, she became sick, and died. When they had washed her, they laid her in an upper room. (Acts 9:37)

In this account the washing is performed on a deceased woman immediately before she is placed in an upper room. The verb describes a physical act done to her body as part of preparing her for being laid out. The narrative sequence is straightforward: illness, death, washing, then placement. Washing here is neither incidental nor symbolic in the sentence itself; it is a concrete step in how the community handles her body, expressing care through cleansing and preparation before she is set in a particular location.

He took them the same hour of the night and washed their stripes, and was immediately baptized, he and all his household. (Acts 16:33)

Here washing is directed toward “their stripes,” presenting an act of attention to injuries. The timing (“the same hour of the night”) highlights urgency and immediacy: the jailer responds at once by washing their wounds. The verb describes an action of cleaning that also implies tending—washing what is visibly marked by suffering. In the verse’s flow this washing stands next to baptism (“was immediately baptized”), so the narrative places a concrete washing of wounds alongside a subsequent rite, yet the word itself continues to denote the physical act: he washed the stripes.

let’s draw near with a true heart in fullness of faith, having our hearts sprinkled from an evil conscience, and having our body washed with pure water, (Hebrews 10:22)

In this exhortation washing is applied to “our body,” and the means is specified: “with pure water.” The phrase is paired with another image—“having our hearts sprinkled from an evil conscience”—so the verse uses bodily and inward language together while keeping them distinct in wording. Washing here still names a washing act, but it is embedded in a call to “draw near,” where preparedness is described in terms of both heart and body. The adjective “pure” attached to “water” shapes how the washing is conceived in the sentence: it is not merely water, but “pure water,” a phrase that intensifies the depiction of cleansing as fitting for approach and confidence in worshipful nearness.

But it has happened to them according to the true proverb, “The dog turns to his own vomit again,” and “the sow that has washed to wallowing in the mire.” (2 Peter 2:22)

In this proverb-like image, washing is attributed to a sow, but the point of the line is the animal’s movement “to wallowing in the mire.” The washing is presented as a completed act (“has washed”), yet it does not prevent a return to filth. The verb thus contributes a stark contrast: being washed on the one hand, and immediately afterward embracing mud on the other. In the verse’s rhetoric, the force lies in the mismatch between cleansing and subsequent behavior; the washing is real as an action, but it is rendered ineffective by the sow’s return to mire.

Sense and Usage

Across these five passages, λούω consistently denotes washing as a concrete act, but the objects and settings vary enough to show its range within ordinary life and moral teaching. It can describe personal cleansing in degrees: a person “has bathed” and yet still “needs to have his feet washed” (John 13:10). That contrast anchors washing to common experience—some washing is total, some is localized and recurring—while allowing “clean” language to be used for assessing a person’s state.

It can also name washing as a careful service performed for others. In Acts 9:37, those present wash a woman after death and before laying her in an upper room; the verb marks a practical, respectful preparation. In Acts 16:33, washing is directed to “stripes,” so the act is not simply routine hygiene but attention to wounds in the night, a response that implies urgency and compassion without changing the word’s basic sense.

In Hebrews 10:22, washing is applied to “our body” and is explicitly “with pure water.” The verse sets this bodily washing alongside the heart being “sprinkled,” and together these images describe readiness to “draw near.” Washing in this context keeps its literal cleansing sense while functioning as part of a larger picture of approach and confidence, where the condition of the body is spoken of in terms appropriate to reverence and access.

Finally, 2 Peter 2:22 uses washing within a biting proverb. The sow “has washed,” and yet the endpoint is “wallowing in the mire.” The washing is used as a foil: it highlights how a cleansed state can be followed by a decisive return to dirt. In this way the act of washing becomes a vivid reference point—an unmistakable change from dirty to clean—so that the subsequent return to mire appears all the more jarring.

Imagery

The passages tie washing to moments when the boundary between clean and unclean matters in practical ways: feet that need attention after bathing (John 13:10), a body prepared with care (Acts 9:37), wounds cleansed in the night (Acts 16:33), a body washed with “pure water” in readiness to draw near (Hebrews 10:22), and an animal washed only to plunge back into filth (2 Peter 2:22). Together they show how a single, ordinary action can bear different weights—routine maintenance, merciful service, preparation, and sharp contrast—depending on what is being washed and what follows after the washing.

Sources: Lexical data from Strong’s Exhaustive Concordance and the Translators Brief Lexicon of Extended Strongs for Greek (STEPBible, CC BY). Occurrence data from the Translators Amalgamated Greek New Testament (STEPBible, CC BY). Scripture quotations from the World English Bible (public domain).