וְכָל־בֶּ֣גֶד וְכָל־ע֔וֹר אֲשֶׁר־יִהְיֶ֥ה עָלָ֖יו שִׁכְבַת־זָ֑רַע וְכֻבַּ֥ס בַּמַּ֖יִם וְטָמֵ֥א עַד־הָעָֽרֶב׃ (פ)
Y toda vestimenta, ó toda piel sobre la cual hubiere el derramamiento del semen, lavaráse con agua, y será inmunda hasta la tarde.
Rashi
וכבס שנית IT SHALL BE WASHED A SECOND TIME — here this expression denotes immersion in a ritual bath (not washing of the garment). The words used in the translation of the Targum for the expressions derived from the root כבס occurring in this section denote making white (cleaning, — e. g. ויתחור), “and it shall be made white” — except for this (וְכֻבַּס) which is not intended to mean making white but to mean immersion. For this reason it is translated in the Targum by ויצטבע — “it shall be dipped”. Similarly wherever it speaks of כבוס בגדים which intend “immersion” the Targum translation is ויצטבע, (this is the Targum of וְכֻבַּס here and in Leviticus 15:17; the active וְכִבֶּס, is, of course, translated by ויצבע).