۞ Say, "Do you really disbelieve in the One Who created the earth in two days? Do you consider things equal to Him? He is the Lord of the Universe. 9 And He placed therein mountains firmly rooted rising above it, and blessed it, and ordained therein the sustenance thereof, all this in four days, complete; this for the inquirers. 10 Then turned He to the heaven when it was smoke, and said unto it and unto the earth: Come both of you, willingly or loth. They said: We come, obedient. 11 So He determined them as seven heavens in two days, and revealed its commandment in every heaven.' 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 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 Aad, they behaved proudly in the earth without right. 'Who is stronger than us?' they would say. Could they not see that Allah, who created them, is stronger than they? But they disbelieved Our signs. 15 Then, on the ominous days, We loosed against them a howling wind that We might let them taste the punishment of humiliation in this life; but more humiliating will be the punishment of the Everlasting Life and they will not be helped. 16 And as for [the tribe of] Thamud, We offered them guidance, but they chose blindness in preference to guidance: and so the thunderbolt of shameful suffering fell upon them as an outcome of all [the evil] that they had wrought; 17 And We delivered those who believed and had been fearing. 18