The Iron - 57:21
Run to forgiveness from your Lord and to a Paradise whose breadth is as the heavens and the earth. It is prepared for those who believe in Allah and His messenger. This is the Grace of Allah which He bestows upon whom He wills and/or whom He wills. Allah is the Owner of Great Grace.
As wide as the heavens:
Explained in Detail/41:11
"Then He turned to the smoking sky and said to it and to the earth, "Come (out of chaos) willingly or unwillingly". They said, "We have come willingly."
Explained in Detail/41:12
So He completed them in two days as seven heavens and revealed to each heaven its special laws. And We equipped the lowest heaven with lamps and a system of protection. This is the plan of the Supreme and All-Knowing.