Reference for Keritot 3:2
אָכַל חֵלֶב וְחֵלֶב בְּהֶעְלֵם אֶחָד, אֵינוֹ חַיָּב אֶלָּא חַטָּאת אֶחָת. אָכַל חֵלֶב וְדָם וְנוֹתָר וּפִגּוּל בְּהֶעְלֵם אֶחָד, חַיָּב עַל כָּל אֶחָד וְאֶחָד. זֶה חֹמֶר בְּמִינִין הַרְבֵּה מִמִּין אֶחָד. וְחֹמֶר בְּמִין אֶחָד מִמִּינִין הַרְבֵּה, שֶׁאִם אָכַל כַּחֲצִי זַיִת וְחָזַר וְאָכַל כַּחֲצִי זַיִת מִמִּין אֶחָד, חַיָּב. מִשְּׁנֵי מִינִין, פָּטוּר:
[If] one ate forbidden fat twice under one spell of unawareness, he is liable for one <i>Chattat</i>. If he ate forbidden fat, and blood, and <i>Notar</i> [a sacrifice that becomes unfit due to being unconsumed past the permitted time], and <i>Piggul</i> [a sacrifice that becomes unfit due to the intention of the officiating priest while offering it, to consume it after its permitted time] under one spell of unawareness, he is liable for each kind. This is [an instance] where different kinds [of material] are more stringent than one kind. And [there is] a stringency with one kind [of material] compared to several kinds such that if [one] ate half an olive-bulk [of forbidden material], and then again half an olive-size of the same kind, he is liable; [if the two pieces were] of two kinds, he is exempt.