﴿ وَأَنَّكَ لَا تَظْمَؤُا۟ فِيهَا وَلَا تَضْحَىٰ ﴾

“and that thou shalt not thirst here or suffer from the heat of the sun."”

And it is indeed assured for you read wa-annaka or wa-innaka as a supplement to the subject of inna sc. laka that is ‘you’ and its clause neither to be thirsty therein nor to suffer the sun’ you will not be exposed to any heat of a midday sun for there is no sun in Paradise.