Overall meaning : Allah Almighty commands all people to worship Him, because He is the One who has created them out of nothing, so that, through such worship, they will attain piety and righteousness; for it is He who has made for them the earth like a carpet spread out, and a fixed, stable place to live, and the sky a roof well-supported, and has sent down water from the clouds and therewith brings forth diverse kinds of fruits for their sustenance.
Then He forbids them from worshipping others besides Him saying: Do not set up so-called rivals and equals to Almighty Allah and worship them besides Him when you know that He is one God with no equals or partners whatsoever.
The subject then shifts to the unbelievers and the hypocrites: If you, unbelievers and hypocrites, really doubt that the Qur’an was revealed by Allah to Muhammad, may Allah bless him and grant him peace, then produce just one surah like the ones in this Qur’an, and seek the aid of all your helpers and witnesses if you rightly claim that the Qur’an is a fabrication.
But if you fail to rise to the challenge and bring what you are asked to bring—which you will never be able to do—then guard yourselves against the Fire, whose fuel is people and stones, prepared for the unbelievers.
Give the good news, Prophet of Allah, to those who firmly believe in what you have brought them and do good deeds that they will have an eternal reward in the life to come: gardens beneath whose trees and mansions rivers flow. Whenever they are given any kind of fruit there, they will think it is the same kind of fruit they were given before in the life of the world (or yet earlier on in Paradise itself). But it is only the same in colour and appearance, yet the taste is totally different. They will also have in these gardens spouses of physical and moral purity, and they will abide there forever.