۞ SAY: "Would you indeed deny Him who has created the earth in two aeons? And do you claim that there is any power that could rival Him, the Sustainer of all the worlds?" 9 (After creating the earth) He set up firm mountains on it, blessed it, and provided it with sustenance in proportion to the needs of all who seek (sustenance). All this was done in four days. 10 Then He directed Himself to the heaven and it is a vapor, so He said to it and to the earth: Come both, willingly or unwillingly. They both said: We come willingly. 11 So He completed them as seven firmaments in two Days, and He assigned to each heaven its duty and command. And We adorned the lower heaven with lights, and (provided it) with guard. Such is the Decree of (Him) the Exalted in Might, Full of Knowledge. 12 Then if they Still turn away, say thou; I warn you of a calamity like the calamity of the 'Aad and Thamud. 13 when the messengers came to them from before them and behind them, saying, 'Worship none but God!" They said, "If our Lord had willed, He would have sent down angels [to us]. Therefore, we shall never believe in your message.'" 14 As for Ad, they waxed proud in the land without justification and said: “Who is greater than we in strength?” Did they not see that Allah, Who created them, is greater in strength than they? They continued to deny Our Signs, 15 We therefore sent a violent thunderstorm towards them in their days of misfortune, in order to make them taste a disgraceful punishment in the life of this world; and indeed the punishment of the Hereafter is more disgracing, and they will not be helped. 16 And as for Thamud, We guided them, but they preferred blindness over guidance, so the thunderbolt of humiliating punishment seized them for what they used to earn. 17 But We delivered those who believed and practised righteousness. 18