۞ Say, "Do you indeed disbelieve in He who created the earth in two days and attribute to Him equals? That is the Lord of the worlds." 9 He placed therein (i.e. the earth) firm mountains from above it, and He blessed it, and measured therein its sustenance (for its dwellers) in four Days equal (i.e. all these four 'days' were equal in the length of time), for all those who ask (about its creation). 10 Then He turned to heaven when it was vapour and said to it and to the earth, "Come willingly or unwillingly." They both said, "We come willingly," 11 So He determined them as seven heavens in two days, and revealed its commandment in every heaven.' 12 BUT IF they turn away, say: "I warn you of [the coming of] a thunderbolt of punishment like the thunderbolt [that fell upon the tribes] of Ad and Thamud!" 13 When the Messengers came to them, from before them and behind them (saying): "Worship none but Allah" They said: "If our Lord had so willed, He would surely have sent down the angels. So indeed! We disbelieve in that with which you have been sent." 14 As for A'ad, they were arrogant in the land without right, and they said: Who is mightier than us in power? Could they not see that Allah Who created them, He was mightier than them in power? And they denied Our revelations. 15 So We sent upon them furious wind in days of evil omen (for them) that We might give them a taste of disgracing torment in this present worldly life, but surely the torment of the Hereafter will be more disgracing, and they will never be helped. 16 As for Thamud, We bestowed guidance upon them, but they preferred to remain blind rather than be guided. At last a humiliating scourge overtook them on account of their misdeeds. 17 And We delivered those who believed and used to keep their duty to Allah. 18