There is no other holy book that defines Almighty God as the holy Qur'an does. It is the best definition of Allah (SWT) that you can ever personally or collectively come across:

'Huwal-lahu ladhi laa ilaha illa Huwa 'Aalimul ghaibi Wa shahaadati Huwar-Rahmaanur-Rahiim. Huwa llahu ladhi laa ilaaha illa Huwal-Mulkul-Qudduus-Salaamul-Mu'minul-Muhaiminul-'Aziizul-Jabbaarul-Mutaka-bbiru. Subhanaallahi 'ammaa yushrikuun. Huwa llahu-I-Khaaliqul-Baari'ul-Musawwiru lahul asmaa'ul-husnaa. Yusab-bihu lahu maa fii samaawaati wal 'ardi wa Huwal 'Aziizul-Hakiim.'

Meaning:
"He Is Allah besides whom there is no deity worthy of worship but He, the Knower of (all things) both secret and open; The Most Gracious, Most Merciful. He Is Allah besides whom there is no deity worthy of worship but He, the Sovereign, The Holy One, The Source of peace (and perfection), The Exalted in Might, The Irresistible, The Supreme. Glorified Is Allah! (High Is He) above the partners they attribute (associate) to Him. He Is Allah The Creator, The Evolver, The Bestower of forms (or colours). To Him belongs the most beautiful names; whatever is in the heavens and on the earth do declare His praises and Glory: and He Is the Exalted in Might, The Wise."

Subhanallah!
Won't it be nice if we can memorize the above to finishing off our prayers by praising Almighty Allah with it?
Imagine again the benefit we will all gain if we forward this for others to appreciate the Qur'an, a Divinely revealed book there has never been any like it & there will never be till eternity! Alhamdulillah for having it as guidance in this world for the hereafter!!!!!!

You have no other God than Allah and what u call other than Him can neither profit you nor harm you.

When death are raise, hell will be a permanent abode for you and the so-called deities you call other than Allah, the Lord of the Throne of Majesty.