Three examples where the Quran is ignored in favour of "I heard it from so and so that the Prophet said...."
1.No punishment for those who change their religion from Islam
Surah 4 verse 137. Those who believe, then reject faith, then believe (again) and (again) reject faith, and go on increasing in unbelief, Allah will not forgive them nor guide them nor guide them on the way.
Kill them in the scholarly traditions
Bukhari Volume 9, Book 84, Number 57: Narrated 'Ikrima:
Some Zanadiqa (atheists) were brought to 'Ali and he burnt them. The news of this event, reached Ibn 'Abbas who said, "If I had been in his place, I would not have burnt them, as Allah's Apostle forbade it, saying, 'Do not punish anybody with Allah's punishment (fire).' I would have killed them according to the statement of Allah's Apostle, 'Whoever changed his Islamic religion, then kill him.'"
2.Flog an adulterer 100 stripes
Surah 24 verses 2 The woman and the man guilty of adultery or fornication, flog each of them with a hundred stripes:
Stone them to death in the ancestor tales
Bukhari Volume 8, Book 82, Number 806:
Narrated Abu Huraira:
A man came to Allah's Apostle while he was in the mosque, and he called him, saying, "O Allah's Apostle! I have committed illegal sexual intercourse.'" The Prophet turned his face to the other side, but that man repeated his statement four times, and after he bore witness against himself four times, the Prophet called him, saying, "Are you mad?" The man said, "No." The Prophet said, "Are you married?" The man said, "Yes." Then the Prophet said, 'Take him away and stone him to death." Jabir bin 'Abdullah said: I was among the ones who participated in stoning him and we stoned him at the Musalla. When the stones troubled him, he fled, but we over took him at Al-Harra and stoned him to death.
Stoning was PRE-ISLAMIC! Bukhari Volume 5, Book 58, Number 188:
Narrated 'Amr bin Maimun:
During the pre-lslamic period of ignorance I saw a she-monkey surrounded by a number of monkeys. They were all stoning it, because it had committed illegal sexual intercourse. I too, stoned it along with them.
3. Whatever is your excess should be paid as Zakaat
Surah 2 verse 219.
They ask you how much they are to spend; Say: "What is beyond your needs." Allah makes clear to you His Signs: In order that you may consider-
[Excess means above your needs, when the harvest is in the excess GIVEN to humanity to share, also, when you receive wages the tax is taken from it for society to use.]
Now reduced to just 2.5%
Bukhari Volume 2, Book 24, Number 534: Narrated Anas:
When Abu Bakr; sent me to (collect the Zakat from) Bahrein, he wrote to me the following:-- (In the name of Allah, the Beneficent, the Merciful). These are the orders for compulsory charity (Zakat) which Allah's Apostle had made obligatory for every Muslim, and which Allah had ordered His Apostle to observe: Whoever amongst the Muslims is asked to pay Zakat accordingly, he should pay it (to the Zakat collector) and whoever is asked more than that (what is specified in this script) he should not pay it; for twenty-four camels or less, sheep are to be paid as Zakat; for every five camels one sheep is to be paid, and if there are between twenty-five to thirty-five camels, one Bint Makhad is to be paid; and if they are between thirty-six to forty-five (camels), one Bint Labun is to be paid; and if they are between forty-six to sixty (camels), one Hiqqa is to be paid; and if the number is between sixty-one to seventy-five (camels), one Jadh'a is to be paid; and if the number is between seventy-six to ninety (camels), two Bint Labuns are to be paid; and if they are from ninety-one to one-hundred-and twenty (camels), two Hiqqas are to be paid; and if they are over one-hundred and-twenty (camels), for every forty (over one-hundred-and-twenty) one Bint Labun is to be paid, and for every fifty camels (over one-hundred-and-twenty) one Hiqqa is to be paid; and who ever has got only four camels, has to pay nothing as Zakat, but if the owner of these four camels wants to give something, he can. If the number of camels increases to five, the owner has to pay one sheep as Zakat. As regards the Zakat for the (flock) of sheep; if they are between forty and one-hundred-and-twenty sheep, one sheep is to be paid; and if they are between one-hundred-and-twenty to two hundred (sheep), two sheep are to be paid; and if they are between two-hundred to three-hundred (sheep), three sheep are to be paid; and for over three-hundred sheep, for every extra hundred sheep, one sheep is to be paid as Zakat. And if somebody has got less than forty sheep, no Zakat is required, but if he wants to give, he can. For silver the Zakat is one-fortieth of the lot (i.e. 2.5%), and if its value is less than two-hundred Dirhams, Zakat is not required, but if the owner wants to pay he can.'