How do we know we are not saying about God what we do not know?
Satan Prohibits Lawful Things
[2:168] O people, eat from the earth’s products all that is lawful and good, and do not follow the steps of Satan; he is your most ardent enemy.
[2:169] He only commands you to commit evil and vice, and to say about GOD what you do not know.
Human beings have a tendency to extrapolate more out of the Quran than what we have. An example of this is debates regarding what happened to the magicians who followed Moses and Aaron (7:120, 20:70, 26:46). Some people argue that they were killed, while others say they weren’t. Some argue that if they were killed would they have gone to heaven or hell.
[3:66] You have argued about things you knew; why do you argue about things you do not know? GOD knows, while you do not know.
[16:74] Therefore, do not cite the examples for GOD; GOD knows while you do not know.
[6:102] Such is GOD your Lord, there is no god except He, the Creator of all things. You shall worship Him alone. He is in control of all things.
[6:103] No visions can encompass Him, but He encompasses all visions. He is the Compassionate, the Cognizant.
What we know about God is what is in the Quran.
The Quran: Everything We Need
[18:109] Say, “If the ocean were ink for the words of my Lord, the ocean would run out, before the words of my Lord run out, even if we double the ink supply.”
These Are All the Words We Need
[31:27] If all the trees on earth were made into pens, and the ocean supplied the ink, augmented by seven more oceans, the words of GOD would not run out. GOD is Almighty, Most Wise.