Quran is enough and explanatory for to practise islam perfectly Quran itself doesn't need another book or religious law to complete it's has been sent down fully and completed by god with purest version of monotheism
Quran 5:101 :
O you who acknowledge, do not ask about things, which if revealed to you, would harm you. If you ask about them after the Quran has been sent down, then they will become clear to you. God pardons for them, and God is Forgiving, Compassionate
Quran 6:114 :
"Shall I seek other than God as a judge when He has sent down to you this book sufficiently detailed?" Those to whom We have given the book know it is sent down from your Lord with truth; so do not be of those who have doubt.
Quran 11:1 :
A book whose signs have been ascertained, then detailed, from One who is Wise, Ever-aware
Quran 16:89 :
We have sent down to you the book as a clarification for all things, a guide, mercy and good tidings for those who have peacefully surrendered
Quran 17:89 :
We have cited to the people in this Quran of every example, but most of the people refuse to be anything but ingrates!
Quran 54:17 :
We made the Quran easy to learn. Do any of you wish to learn?
Quran 29:51 :
Is it not enough for them that We have sent down to you the book, being recited to them? In that is a mercy and a reminder for people who acknowledge.
Quran 36:69 :
We did not teach him poetry, nor does he need it. This is a reminder and a clear Quran.
Quran 22:78 :
Strive in the cause of God properly. He is the One who has chosen you, and He has made no hardship for you in the system, the creed of your father Abraham; He is the One who named you 'those who have peacefully surrendered' from before as well as in this. So let the messenger be witness over you and you be witness over people. So hold the contact prayer and contribute towards betterment and hold tight to God, He is your patron. What an excellent Patron, and what an excellent Supporter.
Quran 30:30 :
So establish yourself to the system of monotheism. It is the nature that God has made the people on. There is no changing in God's creation. Such is the pure system, but most people do not know
To the polytheist Sunni & Shia wrongdoers those are clear verses from Quran
Quran 21:45 :
Say, "I only warn you by revelation." But the deaf do not hear the call when they are warned.
Quran 37:154-157 :
What is wrong with you, how do you judge? Will you not remember? Or do you have a clear proof? Bring forth your book, if you are truthful.
Quran 68:36-41 :
What is wrong with you, how do you judge? Or do you have another book which you study? In it, you can find what you wish? Or do you have an oath from Us, extending until the day of resurrection, that you can judge as you please? Ask them: "Who of them will make such a claim?" Or do they have partners? Then let them bring their partners, if they are truthful.
Quran 10:15 :
When Our clear signs are recited to them, those who do not wish to meet Us said, "Bring a Quran other than this, or change it!" Say, "It is not for me to change it from my own accord, I merely follow what is inspired to me. I fear if I disobey my Lord the retribution of a great day!"
Quran 17:41 :
We have cited in this Quran so they may remember, but it only increases their aversion
Quran 31:27 :
If all the trees on earth were made into pens, and the ocean were supplied by seven more oceans, the words of God would not run out. God is Noble, Wise.
Quran 25:32-33 :
Those who rejected said, "If only the Quran was sent down to him in one go!" It was done as such so We could strengthen your heart with it, and We arranged it accordingly. For every example they come to you with, We bring you the truth and the best explanation.
Quran 75:17 :
It is for Us to collect it and relate it. So when We relate it, you shall follow its revelation. Then it is for Us to clarify it.
TESTIFY OF PROPHET MUHAMMAD IN THE DAY OF JUDGEMENT CRITICING FALSE MUSLIMS (SUNNI & SHIAS) FOR ABANDONING QURAN
Quran 25:30 : The messenger said, "My Lord, my people have deserted this Quran."
THEIR EXPRESSION
Quran 33:67 : They will say, "Our Lord, we have obeyed our leaders and our learned ones, but they misled us from the path."
SECTARIANISM IS FORBIDDEN IN ISLAM GOD IS GIVING EXAMPLES FROM CHRISTIANS AND JEWS
Quran 3:105 :
Do not be like those who separated and differed after the proof had come to them. For them is a painful retribution
Quran 6:159 :
Those who have divided their system and become sects, you have nothing to do with them. Their matter will be with God, then, He will inform them of what they had done
Quran 3:100 :
O you who acknowledge, if you obey a group of those who received the book they will turn you after your acknowledgement into ingrates!
ONE OF THE MOST IMPORTANT VERSES FROM QURAN YOU ARE RESPONSIBLE FOR EVERTHING YOU DO
Quran 17:36 :
Do not uphold what you have no knowledge of. For the hearing, eyesight, and mind, all these are held responsible for that.
Quran 41:53 :
We will show them Our signs in the horizons, and within themselves, until it becomes clear to them that this is the truth. Is it not enough that your Lord is witness over all things?