וְסֻכָּ֛ה תִּהְיֶ֥ה לְצֵל־יוֹמָ֖ם מֵחֹ֑רֶב וּלְמַחְסֶה֙ וּלְמִסְתּ֔וֹר מִזֶּ֖רֶם וּמִמָּטָֽר׃ (פ)
And there shall be a pavilion for a shadow in the day-time from the heat, and for a refuge and for a covert from storm and from rain.
Rashi on Isaiah
And a tabernacle shall be for shade...from heat to protect from the burning of the future sun, as it is said in regard to the wicked (Malachi 3:19): “And the coming sun shall set them ablaze,” for the Holy One, blessed be He, will take the sun out of its case, and cause it to burn them.
Rashi on Isaiah
and for a shelter Heb. וּלְמַחְסֶה. [This is] an expression of covering.