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The International Standard Bible Encyclopedia, Revised
Wash Words translated “wash” find their use mainly in connection with the ceremonial cleansings and sacrificial procedures of OT religion, in figurative language having to do with sin and guilt, and in connection with the practice of footwashing.Hebrew rāḥaṣ is broadly used. It can refer to foot
Eerdmans Bible Dictionary
Wash (Heb. rāḥaṣ; Gk. níptō). The act of cleansing was performed with regard to personal cleanness as well as ritual purification. The references to ordinary washing mention specifically only the feet (Gen. 18:4; 19:2; 24:32; 43:24), the hands (Exod. 30:19, 21), and the face (Gen. 43:31). In
Dictionary of Biblical Imagery
Wash, Washing
Wash, Washing“Cleanliness is, indeed, next unto godliness.” Although the idea is likely of earlier Hebrew origin, John Wesley’s well-known comment about appropriate dress combines two of the central ideas in the biblical usage of wash or washing. He realized that physical cleanness is in some fashion
International Standard Bible Encyclopedia
WASH, WASHING<wosh,> (wosh’ing:The two usual Heb words for “wash” are רָ֖חץ‎, rāhaç, and כָּ֖בס‎, kābhas, the former being normally used of persons or of sacrificial animals (Genesis 18:4, etc, often translated “bathe”; Leviticus 15:5, etc), and the latter of things (Genesis 49:11, etc),
Holman Treasury of Key Bible Words: 200 Greek and 200 Hebrew Words Defined and Explained
WashGreek expression: louō, niptōPronunciation: LOO oh, NEEP tohStrong’s Numbers: 3068, 3538Key VersesJohn 13:5–6, 8, 10The Greeks had two different words for “washing.” Niptō was used to denote the “washing of the feet and hands”; louō was used to denote a “complete bathing.” The difference
The International Standard Bible Encyclopaedia, Volumes 1–5
Wash, Washing
WASH, wosh, WASHING, woshʹing: The two usual Heb words for “wash” are רָחַץ‎, rāḥaç, and כָּבַס‎, kābhaṣ, the former being normally used of persons or of sacrificial animals (Gen 18:4, etc, often trd “bathe”; Lev 15:5, etc), and the latter of things (Gen 49:11, etc), the exceptions to this distinction
Key passages
Ex 30:18–21

“And you will make a basin of bronze and its bronze stand for washing, and you will put it between the tent of assembly and the altar, and you will put water there. And Aaron and his sons will wash their hands and their feet with it. When they come to the tent of assembly, they will wash …

Le 14:8

Then the one who presents himself for cleansing shall wash his garments, and he shall shave off all his hair, and he shall wash himself in the water; thus he shall be clean, and afterward he shall enter the camp, but he shall stay outside his tent for seven days.

Le 17:15

“And if there is any person who eats a dead body or a mangled carcass, whether among the native or among the alien, then he shall wash his garments, and he shall wash himself with water, and he shall be unclean until the evening, and he shall be clean.

Nu 19:7

The priest will wash his garments and his body in the water, and afterward he will come to the camp; the priest will be unclean until the evening.