לֹ֣א תֹאכְל֣וּ כָל־נְ֠בֵלָה לַגֵּ֨ר אֲשֶׁר־בִּשְׁעָרֶ֜יךָ תִּתְּנֶ֣נָּה וַאֲכָלָ֗הּ א֤וֹ מָכֹר֙ לְנָכְרִ֔י כִּ֣י עַ֤ם קָדוֹשׁ֙ אַתָּ֔ה לַיהוָ֖ה אֱלֹהֶ֑יךָ לֹֽא־תְבַשֵּׁ֥ל גְּדִ֖י בַּחֲלֵ֥ב אִמּֽוֹ׃ (פ)
Ye shall not eat of any thing that dieth of itself; thou mayest give it unto the stranger that is within thy gates, that he may eat it; or thou mayest sell it unto a foreigner; for thou art a holy people unto the LORD thy God. Thou shalt not seethe a kid in its mother’s milk.
Mishnah Demai
The [second tithe of] demai is not subject to [the rules of adding a] fifth. It has no mandated time of removal. It may be eaten by an onen. It may be brought into Jerusalem and taken out again. They may allow a small amount to be lost on the road. One may give it to an am haaretz and consume its equivalent in Jerusalem. [Second tithe money of demai] may be redeemed silver [coins] for [other] silver [coins], copper [coins] for [other] copper [coins], silver for copper, and copper for produce, provided that the produce is again redeemed for money, the words of Rabbi Meir. But the sages say: the produce itself must be brought up and eaten in Jerusalem.