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Question

I have a question about attributes of letters. The following letters fall in mehmusa (weak) category: Fa, Thaa’, Ha, Sheen, Kha', Saad, Seen, Kaaf, and Ta’. If the general idea behind this is that these letters are pronounced without force, then what about other letters such as Ba or Daal? When I hear a Qari, I don't detect extra softness or force when they pronounce Ba or Daal compared to other mehmusa letters (?). I am similarly confused about other categories such as Shadeeda, Musta-alia etc. I am missing this by a mile. Please guide me. May Allah reward you for your excellent efforts in teaching us.

Answer

The characteristics of the letters, or if you wish to use the term “attributes”, that is fine, are at least 5 for each letter.  There are 5 pairs of characteristics and each letter has one or the other of the pair.  If we talk about the letters of “hams," in Arabic, , then we need to talk about its opposite,  to understand first of all, what these characteristics are, and secondly, why one of them is considered a weak characteristic, and the other strong.  A letter that has the characteristic of is  called (mahmus).  This is just to make clear the two terms, one is the characteristic itself ( ), the other the letter that has the characteristic is labeled: .  The definition of  is: Running on of breath when pronouncing the letter due to weakness in its origin, when weakening reliance on the letter at its articulation point of origin. 
The first thing to note is that the running of breath is what causes the weakness in this characteristic.  When pronouncing a letter and the breath running out of the mouth at the same time, the reliance on the articulation point weakens.  It is not something an Arab or a good reciter will intentionally do, it is a natural occurrence in the letter when it is pronounced correctly.  The opposite of , as previously stated is .  Any given letter has either the characteristic of , or the characteristic of .  No letter can have both of these characteristics, and no letter has neither of them. 
The definition of  is: Imprisonment of running on of breath when pronouncing a letter due to strength  in its origin when strengthening reliance on it at its articulation point.
With this characteristic we see the breath does not run out when the letter is articulated; this strengthens the reliance on the articulation point of the letter, and thus is a strong characteristic. 

The letters that have  are the letters in the group: , all other letters have the characteristic of , or imprisonment of the running of breath. 

The other characteristics that are paired with an opposite are:

 and , and their opposite:

 and its opposite,

 and its opposite

The fifth pair has no affect on the sound or pronunciation of the letters, so will not be included. 

Each of these pairs have definitions.  For example:  (strength) is: Imprisonment of the running of the sound when pronouncing a letter to complete the reliance on the articulation point. 
This characteristic is about the running of sound, not breath, but again the same principle applies.  If the sound is imprisoned, the reliance on the articulation point increases, thus the letter ends up stronger. The letters that have this characteristic are in the group:
 (softness) is running of the sound when pronouncing a letter, weakening the reliance on the articulation point. The letters of this group are all the rest after taking out the letters and the letters of "moderation", (moderation) is an in between characteristic defined as: The letter is in between the two characteristics; between strength and softness so that the sound is partially imprisoned and partially running when pronouncing the letter.  You may note that this group has three “pairs”.  As in the other groups, a single letter has only one of these three characteristics, and every letter has one of the three. 

You can see then why an individual characteristic is classified as “weak” or “strong”.  It isn’t an unnatural force the reciter puts on the letter or removes from the letter, but instead a natural characteristic inherent in the Arabic letter that is either weak or strong.  You need to study the definitions of the characteristics to understand why each one is considered strong or weak. 

Learning to pronounce the Arabic letters with all their characteristics is the goal every reciter of the Qur’an, or student of tajweed should place in front of them.  Letters that share articulation points are differentiated in sound with the characteristics.  If the letter , which is articulated from the two lips was pronounced with , a characteristic it does NOT have, the letter would not sound like a , but instead like a “p”.  Similarly, the letter  articulated between the edges of the two upper front incisors and the inside of the bottom lip, has the characteristic of  (running of breath); if a reader were to pronounce it without this characteristic, it would sound like a “v”.  These are examples of Arabic letters changing into foreign letters, but Arabic letters that are not given their full characteristics can change into another Arabic letter from the same articulation point.  

We will, insha’ Allah, after finishing the medd (lengthening) section, go on to the detailed study of the characteristics in the tidbit lessons.  May Allah reward you, increase your knowledge, and make you of the people of the Qur’an.