וְכִ֥י תֹאמַ֖ר בִּלְבָבֶ֑ךָ אֵיכָה֙ נֵדַ֣ע אֶת־הַדָּבָ֔ר אֲשֶׁ֥ר לֹא־דִבְּר֖וֹ יְהוָֽה׃
And if thou say in thy heart: ‘How shall we know the word which the LORD hath not spoken?’
Find Mishnaic references to Deuteronomy 18:21: , passages from the 63 tractates of the Mishnah.