How authentic is the Quran in our hands?

Question

I see Sana'a manuscript of Quran and Samarkand (Tashkent) Quran. Many words and sentences do not match today's Quran. Is today's Quran authentic?

Reply

The original Quran that was revealed to prophet Muhammad did not have tashkeel (signs above letters) nor did it have dots above and below letters. These were added at a later stage with the aim of ensuring the correct recitation of the Quran.

There are also minor differences between the 2 widely circulated Quranic manuscript today (Hafz and Warsh). The differences are in the spelling of a small number of words (not many sentences as you implied). The recent counts of letters of many Suras, together with the code of the Quran, confirmed that the Hafz version is the more reliable version of the two.

In any case, none of these minor spelling differences alter the message of the Book nor the law of God in the Quran. More important, God promised that the Quran will be preserved (15:9). What this means is that we should concentrate on obeying the law of God given in the Quran, and let God worry about the preservation of the Quran.

When we stand in front of God on the Day of Judgement, He will not ask us about the Sana or Samarkand Qurans, but we will be accountable to whether we obeyed and followed the Quran in our hands or not.

In the Quran, we are given clear instructions to follow the Quran as the only source of religious guidance and law. All the rituals, practices, prohibitions, and instructions are fully detailed in the Quran. Please see: Quran: a fully detailed Book

How do you utter your Shahada? How do you observe your Salat, and how many times a day? How do you observe your Zakat, to whom and when? The Quranic law provides every little detail about all those.and all other religious matters.

Those are some of the things you should be worrying about if you wish to attain an honourable judgement on the important Day.