This Hadith has already been mentioned, and is repeated here to highlight the eminence of knowledge and to induce Muslims to gain it. We learn from this Hadith that there are three categories of people. First, those who acquire knowledge of the Qur'an and Hadith, act upon it and also impart it to others. Such people benefit from this knowledge themselves and extend this benefit to others also. By virtue of this quality they are the best of all. Second, those people who acquire knowledge and impart it to others, but do not fulfill the requirements of that knowledge. Such people are inferior in rank to the people of the first category and can be taken to task for their omissions. Third, those who shun the knowledge of the Qur'an and Hadith. Neither they study and hear the two themselves for their own benefit, nor do they acquire knowledge to impart it to others for their benefit. This is the worst category of people. Every Muslim should try to be in the first category of the people.