The Sahabah also provided information about the circumstances under which the verses were revealed, which further clarified their meanings. However, the Tafseer transmitted from the Prophet and the Sahabah did not cover all of the verses of the Quran. The Prophet explained only what was unclear to the Sahabah.

Tafseer of the Quran by the Arabic Language

With the passage of time, words took on new meanings and old meanings became lost, foreign words entered into the language and vast sections of vocabulary fell into disuse. This natural process necessitated the explanation of some of the Quranic verses according to their literal and logical meanings. Consequently, this period witnessed the appearance of dictionaries such as Mukhtar As-Sihah, written specifically to deal with the Quranic Arabic vocabulary and philology.

In cases where words had more than one meaning, this step created differences of opinion, which could only be solved by finding some support in the Sunnah. For example, the word 'Lams' literally means to touch but figuratively means sexual intercourse, thus Muslim scholars were of two basic opinions concerning the following verse (which means): “…Or you have touched women and find no water, then seek clean earth and wipe over your faces and your hands…” [Quran: 4:43]

Imams Ash-Shafi'ee and Malik held that it meant the touch of the hand, though each Imam added certain stipulations to it. On the other hand, Imam Abu Haneefah ruled that it meant sexual intercourse. The Prophet’s wives reported that on some occasions, he kissed them before performing prayers, which indicates that touching was not intended by this verse.

Tafseer of Quran by Opinion

Opinions based on a careful study can be considered valid as long as they do not contradict any known authentic explanations. Likewise, the application of obvious meanings of the Quran to existing situations and the formation of conclusions based on their similarities is also allowed as long as such interpretations do not clash with authentic classical explanations. However, free interpretation based on philosophical, scientific or sectarian ideas is totally forbidden. The Prophet was reported to have said thrice: "Opinion-based arguments about the Quran is Kufr (disbelief)." Then he said: "What you know of it, act on it; and what you are ignorant of, refer it to one who knows." [Ahmad]

We can see from the above mentioned narration that the Prophet sternly warned his companions and later generations of Muslims concerning the interpretations of the Quran based on speculation and unsubstantiated opinions. This was done because the Quran is the foundation of Islam and, as such, it had to remain pure and untampered with.

If free rein were given to any and every one to interpret the Quran as he wished, its value would be totally destroyed and Islam itself would be undermined from its foundation. Thus, the only accepted Tafseer is that which follows the following sequence: Tafseer of the Quran by the Quran, Tafseer by the Sunnah, Tafseer by the sayings of the Sahabah, Tafseer by language, and finally, Tafseer by opinion.