Question
  As Salam
  Aliykum:
  
  We are studying surah Qiyamah ayat 12  and there is a tanween on the 
   it
  is
 
  it
  is
  pronounced 
  yuma
  
  ’ idhin-il. Is this a Tajweed rule or a rule of the Arabic language?
  Can you expand on that combination.
  
  Thank you
  Answer
  Wa alaikum
  assalaam wa rahmatu Allahi wa barakatuh.
  The last two
  words of aayah 12 of surah Al-Qiyamah 
   have
  two saakin letters meeting, the first of the two saakin letters is the
 have
  two saakin letters meeting, the first of the two saakin letters is the 
   of the tanween; the second of the two
  saakin letters is the
of the tanween; the second of the two
  saakin letters is the 
   of
  the definite article “the” or the
 of
  the definite article “the” or the 
   of
of  
   . 
  In the Arabic language there is a prohibition of two saakin letters
  meeting and being pronounced between two words, so when this occurs the first
  letter is changed so that two saakin letters are not pronounced together. 
  In this case, the
 . 
  In the Arabic language there is a prohibition of two saakin letters
  meeting and being pronounced between two words, so when this occurs the first
  letter is changed so that two saakin letters are not pronounced together. 
  In this case, the 
   saakinah
  of the tanween is read with a kasrah instead of the normal sukoon.
 saakinah
  of the tanween is read with a kasrah instead of the normal sukoon. 
  There are five
  different rules for reading when two saakin letters meet between two words
  depending on what the first letter is: 
  The first rules
  is:
  1. If the first
  letter of the two saakin letters is a medd letter, then the medd is dropped in
  pronunciation and we read directly from the letter before the medd letter to
  the saakin letter that is the first pronounced letter of the next word. 
  Examples:
  
  
  
  
  
   
   
  
  2. 
  If the first letter of the two saakin letters is a wow leeniyyah (
   saakinah with a fat-h before it), then
  this
 saakinah with a fat-h before it), then
  this 
   acquires
  a dhammah.  Examples:
 acquires
  a dhammah.  Examples: 
  
  
  
  
  3. 
  If the first saakin letter of the two is the plural 
   , then this meem acquires a dhammah. 
  This is exemplified in:
, then this meem acquires a dhammah. 
  This is exemplified in:
  
  
  
   4. If the first saakin letter of the two is the 
   in
  the word
 in
  the word 
   , the
, the 
   acquires a fat-h, as in:
 
  acquires a fat-h, as in:
  
  
  
   5.  In all other cases the
  first of the two saakin acquires a kasrah. 
  Examples of this are:
  
  
  
  
  
  
  The last
  example in this section  
   is another tanween followed by a saakin letter, but in this case, the
  tanween is a fat-h tanween.
 
  is another tanween followed by a saakin letter, but in this case, the
  tanween is a fat-h tanween. 
   
  
  This shows that
  this phenomenon can occur with all three types of tanweens, and the rule is
  the same for all, the 
   saakinah
  of the tanween is read with a kasrah, even though this kasrah is not written
  in the copy of the Qur’an.
 saakinah
  of the tanween is read with a kasrah, even though this kasrah is not written
  in the copy of the Qur’an. 
  
You
  are welcome