Where in the quran does it ask those who know?
I thought the quran was all you needed since its a perfect book?
[Quran 6:38] ..We did not leave anything out of this book..
You need many things, the perfection of the book does not detract from that. You need the tools to understand it to start with. You need the context, you need sound Arabic, you need sound mind, you need the understanding of the one who conveyed the Message itself to you.
The Qur'an sets out the role of Messengers and Prophets (alayhis salaam) as teachers as well as conveyors of revelation. That is why there are Prophets at all. Clearly if all that was intended was a static book, then there would be no function for either. This is an illogical position, and contradicted by the Qur'an.
The Qur'an says:
2:129
"O our Sustainer! Raise up from the midst of our offspring
106an apostle from amongthemselves, who shall convey unto them Thy messages, and impart unto them revelation
as well as wisdom, and cause them to grow in purity: for, verily, Thou alone art almighty, trulywise!"
(which shows that Allah does not confine the teaching of knowledge to revelation)
2:237-9
BE EVER mindful of prayers, and of praying in the most excellent way;
and stand beforeGod in devout obedience.
But if you are in danger, [pray] walking or riding;
andwhen you are again secure, bear God in mind - since it is He who taught you what you did not previously know.
(which shows that God taught people how to pray, something taught not through the Qur'an, but to Mohammed sullAllahu alayhi wasalaam and then to the people by God)
2:151
Even as We have sent unto you an apostle from among yourselves to convey unto you Our messages, and to cause you to grow in purity, and
to impart unto you revelation and wisdom,
and to teach you that which you knew not:
(again, showing that the role of Prophethood is not merely dumb conveyance)
3:31-1
Say [O Prophet]: "If you love God, follow me, [and] God will love you and forgive you your sins; for God is much-forgiving, a dispenser of grace."
Say: "Pay heed unto God and the Apostle."
(this verse occurs in an exhortation to beware of the day of judgement, and is not a temporary command)
3:132-5
And pay heed unto God and the Apostle, so that you might be graced with mercy. And vie with one another to attain to your Sustainer's forgiveness and to a paradise as vast as the heavens and the earth, which has been readied for the God-conscious who spend [inHis way] in time of plenty and in time of hardship, and hold in check their anger, and pardon their fellow-men because God loves the doers of good; and who, when they have committed a shameful deed or have [otherwise] sinned against themselves, remember God and pray that their sins be forgiven - for who but God could forgive sins? - and do not knowingly persist in doing whatever [wrong] they may have done.
(again, we see the two sources presented,
if the Qur'an is all you need, why is the Qur'an telling you to pay heed to something else???)
3:164
Indeed, God bestowed a favour upon the believers when he raised up in their midst an apostlefrom among themselves,
to convey His messages unto them, and to cause them to grow in purity,
and to impart unto them the divine writ as well as wisdom - whereas before that theywere indeed, most obviously, lost in error
(I can go all day, the amount of verses that point to the Prophets being transmitters not merely of revelation but also of hikma, are everywhere, if the Qur'an is all the wisdom that exists, then why does it refer to hikma other than itself?)