עֻ֥צוּ עֵצָ֖ה וְתֻפָ֑ר דַּבְּר֤וּ דָבָר֙ וְלֹ֣א יָק֔וּם כִּ֥י עִמָּ֖נוּ אֵֽל׃ (ס)
Take counsel together, and it shall be brought to nought; Speak the word, and it shall not stand; For God is with us.
Ibn Ezra on Isaiah
Take counsel, etc. Whatever you will counsel against Jerusalem will not be realised. עצו. Take counsel. A biliteral verb (ע״ו). According to R. Moses Hakkohen, י is dropped, and it should be יעוצו like זכורו (Neh. 4:8).18If this is the exact form of the word meant by Ibn Ezra, he must have read זְכוּרוּ like יְעוּצוּ. Our editions have זְכׂרוּ.
Ibn Ezra on Isaiah
כי עמנואל. For God is with us. Here we have the reason for עמנואל Immanuel being the name of the prophet’s son.