וְהָיְתָ֥ה לָּהֶ֖ם לְחֻקַּ֣ת עוֹלָ֑ם וּמַזֵּ֤ה מֵֽי־הַנִּדָּה֙ יְכַבֵּ֣ס בְּגָדָ֔יו וְהַנֹּגֵ֙עַ֙ בְּמֵ֣י הַנִּדָּ֔ה יִטְמָ֖א עַד־הָעָֽרֶב׃
And it shall be a perpetual statute unto them; and he that sprinkleth the water of sprinkling shall wash his clothes; and he that toucheth the water of sprinkling shall be unclean until even.
Find Talmudic references to Numbers 19:21: , passages from the Talmud Bavli and Yerushalmi.