כִּ֤י כְהַר־פְּרָצִים֙ יָק֣וּם יְהוָ֔ה כְּעֵ֖מֶק בְּגִבְע֣וֹן יִרְגָּ֑ז לַעֲשׂ֤וֹת מַעֲשֵׂ֙הוּ֙ זָ֣ר מַעֲשֵׂ֔הוּ וְלַֽעֲבֹד֙ עֲבֹ֣דָת֔וֹ נָכְרִיָּ֖ה עֲבֹדָתֽוֹ׃
For the LORD will rise up as in mount Perazim, He will be wroth as in the valley of Gibeon; That He may do His work, strange is His work, And bring to pass His act, strange is His act.
Find Mishnaic references to Isaiah 28:21: , passages from the 63 tractates of the Mishnah.