﴿ رِّزْقًۭا لِّلْعِبَادِ ۖ وَأَحْيَيْنَا بِهِۦ بَلْدَةًۭ مَّيْتًۭا ۚ كَذَٰلِكَ ٱلْخُرُوجُ ﴾

“as sustenance appor­tioned to men; and by [all] this We bring dead land to life: [and] even so will be [man’s] coming-forth from death.”

as provision for Our servants rizqan li’l-‘ibādi is a direct object denoting reason; and with it We revive a dead land baldatan may be followed equally by the masculine maytan or the feminine adjective maytatan. So like that manner of reviving shall be the rising from the graves so how can you deny it? the interrogative is meant as an affirmative; the meaning then is that they have indeed observed all of these things and are aware of what has been mentioned yet they disbelieve.