וְהָיָ֖ה לְמִקְדָּ֑שׁ וּלְאֶ֣בֶן נֶ֠גֶף וּלְצ֨וּר מִכְשׁ֜וֹל לִשְׁנֵ֨י בָתֵּ֤י יִשְׂרָאֵל֙ לְפַ֣ח וּלְמוֹקֵ֔שׁ לְיוֹשֵׁ֖ב יְרוּשָׁלִָֽם׃
And He shall be for a sanctuary; but for a stone of stumbling and for a rock of offence to both the houses of Israel, for a gin and for a snare to the inhabitants of Jerusalem.
Rashi on Isaiah
And it shall be for a portent That plan that Shebna plotted and that Pekah plotted to overthrow the kingdom of the House of David, shall be an omen [a preparationmss.] of the disaster destined to befall them.
Rashi on Isaiah
for a portent Heb. לְמִקְדָשׁ, comp. (Num. 12:18) “Prepare yourself (הִתְקַדְּשׁוּ) for the morrow.”