Some disbelievers claimed that Allah is confused which He created first between Heaven and Earth. In S2:29 He says Earth while S79:27-30 says it is Heaven?
S2:29 It is He who created for you all of that which is on the earth. Then He directed Himself to the heaven and made them seven heavens, and He is Knowing of all things.
S79:27-30 Are you a more difficult creation or is the heaven? Allah constructed it. He raised its ceiling and proportioned it. And He darkened its night and extracted its brightness. And after that He spread the earth.
The earth and the heaven was created by Allah on the same day –
S9:36 The number of months in the sight of Allah is twelve in a year so ordained by Him the day He created the heavens and the earth; of them four are sacred: that is the straight usage. So wrong not yourselves therein, and fight the Pagans all together as they fight you all together. But know that Allah is with those who restrain themselves.
A day to Allah is like a thousand years to you –
S22:47 And they urge you to hasten the punishment. But Allah will never fail in His promise. And indeed, a day with your Lord is like a thousand years of those which you count.
That was the day Allah created the heaven and the earth!
Pondering with Saifuddin's index 