Every impure person must immerse himself in water to become pure

'Now if a man has a seminal emission, he shall bathe all his body in water and be unclean until evening.

Hebrew

וְאִישׁ כִּי־תֵצֵא מִמֶּנּוּ שִׁכְבַת־זָרַע וְרָחַץ בַּמַּיִם אֶת־כָּל־בְּשָׂרוֹ וְטָמֵא עַד־הָעָרֶב׃ ‬

Greek

καὶ ἄνθρωπος ᾧ ἐὰν ἐξέλθῃ ἐξ αὐτοῦ κοίτη σπέρματος καὶ λούσεται ὕδατι πᾶν τὸ σῶμα αὐτοῦ καὶ ἀκάθαρτος ἔσται ἕως ἑσπέρας

• Parashah: Metzorah
• Mishneh Torah: Ritual Purity — Other Sources of Uncleanness

• Leviticus 15:16

Enumeration and classification from BibleData. The Greek is the Septuagint reading of the same verse, carried by the source for comparison.