Is Islamic Inheritance ordained in the Qur’an?

Yes, Allah, Himself has stated how the inheritance is to be shared, and He has issued a warning against ignoring this division.
He says (What could be translated as):
” These are the limits (set by) Allaah (or ordainments as regards laws of inheritance), and whosoever obeys Allaah and His Messenger (Muhammad) will be admitted to Gardens under which rivers flow (in Paradise), to abide therein, and that will be the great success.”
“And whosoever disobeys Allah and His Messenger (Muhammad), and transgresses His limits, He will cast him into the Fire, to abide therein; and he shall have a disgraceful torment”
[al-Nisa’ 4:13, 14]