Leviticus 13:6וְטִהֲרוֹ
The priest will examine him again on the seventh day, and if the sore has faded and has not spread on the skin, the priest shall pronounce him clean; it is a rash. The person must wash his clothes and be clean.
Numbers 19:12יִטְהָר
He must purify himself with the water on the third day and on the seventh day; then he will be clean. But if he does not purify himself on the third and seventh days, he will not be clean.
2 Kings 5:10וּטְהָר
Then Elisha sent him a messenger, who said, “Go and wash yourself seven times in the Jordan, and your flesh will be restored, and you will be clean.”
2 Chronicles 29:15לְטַהֵר
When they had assembled their brothers and consecrated themselves, they went in to cleanse the house of the LORD, according to the command of the king by the words of the LORD.
Nehemiah 12:30וַיִּטַּהֲרוּ
After the priests and Levites had purified themselves, they purified the people, the gates, and the wall.
Ezekiel 22:24מְטֹהָרָה
“Son of man, say to her, ‘In the day of indignation, you are a land that has not been cleansed, upon which no rain has fallen.’

Brown-Driver-Briggs

טָהֵר vb. be clean, pure

Qal

1. be clean, i.e. (miraculously) freed from leprosy by washing in the Jordan

2. be clean ceremonially

3. be clean morally

Pi.

1. cleanse, purify

2. pronounce clean, ceremonially

3. perform the ceremony of cleansing

Pu. a land not cleansed

Hithp.

1. purify oneself

2. present oneself for purification

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.