Zevachim11: 8
בִּשֵּׁל בּוֹ קָדָשִׁים וְחֻלִּין, אוֹ קָדְשֵׁי קָדָשִׁים וְקָדָשִׁים קַלִּים — אִם יֵשׁ בָּהֶן בְּנוֹתֵן טַעַם, הֲרֵי הַקַּלִּים נֶאֱכָלִין כַּחֲמוּרִין; וְאֵינָן טְעוּנִין מְרִיקָה וּשְׁטִיפָה, וְאֵינָם פּוֹסְלִין בְּמַגָּע. רָקִיק שֶׁנָּגַע בְּרָקִיק, וַחֲתִיכָה בַּחֲתִיכָה — לֹא כָל הָרָקִיק וְלֹא כָל הַחֲתִיכוֹת אֲסוּרִין; אֵינוֹ אָסוּר אֶלָּא מְקוֹם שֶׁבָּלַע.
[If] one cooked in it sacred and non sacred [meat], or [the meat of] most holy offerings and [of] offerings of lesser holiness — if there is enough of them to impart flavor, the less stringent ones must be eaten in the manner of the more stringent ones; and they do not require purging and rinsing, nor do they disqualify by contact. [If] a wafer comes in contact with [another] wafer, or a slice [of meat] with [another] slice — neither the entire wafer nor the entire slice is forbidden; only the place which has absorbed is [rendered] forbidden.