Mishnah Zavim 5:11: A ba'al keri [one who had a nocturnal seminal emission] is [unclean] like one who touched a sheretz [he does not become a father of uncleanness]. One who has sexual relaions with a menstruant is [unclean] like one who has corpse uncleanliness [and is a father of uncleanness]. However, the one who had sexual relaions with a menstruant is more stringent, because he conveys minor grades of uncleanliness to what he lies or sits on, so as to make foods and liquids unclean.

בַּעַל קֶרִי, כְּמַגַּע שֶׁרֶץ. וּבוֹעֵל נִדָּה, כִּטְמֵא מֵת, אֶלָּא שֶׁחָמוּר מִמֶּנּוּ בּוֹעֵל נִדָּה, שֶׁהוּא מְטַמֵּא מִשְׁכָּב וּמוֹשָׁב טֻמְאָה קַלָּה לְטַמֵּא אֳכָלִין וּמַשְׁקִין:

Mishnah Zavim 5:12: The following invalidate teruma, one who eats food of the first degree [of uncleanliness] one who eats food of the second degree [of uncleanliness], one who drinks unclean liquids, one immerses [ritually] his head and the greater part [of his body] in water drawn, a clean person upon whose head and greater part of his body fell three log [measure of volume] of drawn water [for until he has obtained complete immersion his touch invalidates terumah], or a scroll [of scriptures], [unwashed] hands, a tevul yom [one who has immersed in a mikvah but must wait until sunset to be rendered clean], food or vessels that became unclean by liquids.

אֵלּוּ פוֹסְלִים אֶת הַתְּרוּמָה. הָאוֹכֵל אֹכֶל רִאשׁוֹן, וְהָאוֹכֵל אֹכֶל שֵׁנִי, וְהַשּׁוֹתֶה מַשְׁקִין טְמֵאִין, וְהַבָּא רֹאשׁוֹ וְרֻבּוֹ בְּמַיִם שְׁאוּבִין, וְטָהוֹר שֶׁנָּפְלוּ עַל רֹאשׁוֹ וְעַל רֻבּוֹ שְׁלשָׁה לֻגִּין מַיִם שְׁאוּבִין, וְהַסֵּפֶר, וְהַיָּדַיִם, וּטְבוּל יוֹם, וְהָאֳכָלִים וְהַכֵּלִים שֶׁנִּטְמְאוּ בְמַשְׁקִים: