ישעיהו סו:יז פירוש: רש״י ואבן עזרא

Those who prepare themselves Heb. הַמִּתְקַדְּשִׁים. Those who prepare themselves, “Let you and me go on such-and-such a day to worship such-and-such an idol.”

That sanctify themselves, for idolatry.

to the gardens where they plant vegetables, and there they would erect idols.