Tafsir Ibn Abbas: Ash-Shura, Ayah 35

And that those who dispute concerning Our signs may know read indicative wa-ya‘lamu ‘and they know’ beginning a new sentence; or subjunctive wa-ya‘lama ‘and that they may know’ as a supplement to an implicit reason in other words ‘He drowns them in order to exact vengeance against them and so that they may know that …’ they have no refuge no escape from the chastisement the negation represents two direct objects of the verb ya‘lamu or ya‘lama ‘they know’; the negation is also a comment on the implied action of ‘escaping’.