Talmud for Chagigah 2:5
נוֹטְלִין לַיָּדַיִם לְחֻלִּין וּלְמַעֲשֵׂר וְלִתְרוּמָה. וּלְקֹדֶשׁ, מַטְבִּילִין. וּלְחַטָּאת, אִם נִטְמְאוּ יָדָיו, נִטְמָא גוּפוֹ:
One washes his hands for chullin, tithe (ma'aser), and terumah. [Washing them from a vessel which contains only a revi'ith of water is sufficient.] And for kodesh (consecrated food), he immerses them [i.e., To eat peace-offerings, sin-offerings, and guilt-offerings, he requires a higher purification. He must immerse his hands in (a mikveh of) forty sa'ah — even if they are only stam yadayim ("plain hands"), not having touched an unclean object which makes the entire body unclean by Torah ordinance.] And for chatath — if his hands become unclean, his body becomes unclean. [In order to touch the waters of chatath (purification), the water sanctified with the ashes of the red heifer, to sprinkle therefrom upon those who have become unclean by (contact with) a dead body, he requires a higher (level of) purification, viz.: If his hands became unclean through one of those things which impart uncleanliness to the hands but not to the body — such as a scroll, unclean foods, unclean liquids, or anything else declared unclean by rabbinic ordinance — his body, too, becomes unclean, and his entire body requires immersion. All of these levels (of purification), one higher than the other, are rabbinically ordained. They are mentioned here together with the laws of the festival offering by virtue of their concluding (in the next chapter) with the laws of the festival, i.e., that the unlearned are regarded as clean on a festival, but not on the other days of the year.]