The following is rule two of four for the Noon
Al-Saakinah/Tanween. We all recognize the children’s game, hide, and seek.
Here, the Noon Al-Saakinah must be hidden [i.e., not pronounced clearly].
The letters which are covered in rules three and four are
the exception to this rule.
These letters are: laam raa yaa noon meem waa baa
When one of the left letters follows noon qalqalah letters saakinah or tanween,
ikhfaa must be done. This is when the noon saakinah or tanween is hidden in the
nose. Here, the mouth is to be shaped in a way such that it is “prepared” for
the next letter.
For example, if the next letter is a taa with a dhammah then
the mouth can say this by changing it into a small “o” shape, and the tongue
places itself in the right place within the mouth. This can occur across two
words or be contained in one. Ikhfaa must be sounded for two counts, i.e., the
time it takes to say the words, “one-two.”
You don't need to read all these idgham letters. It is
however recommended that you learn the six ith-haar, and seven exceptions,
letters and so when reading, do a quick check to see if the letter is not one
of the six ith-haar letters or the exception letters above, then do ikhfaa.
This takes a while to get accepted to, and soon you’ll forget you even have to
do a check because you internalize it.
Besides, it’d be nearly impossible to try and bring out an
“nn” sound from your nasal passage when wanting to shape your mouth for a“h”
sound for haa, or an “a” sound for alif.
Letters are now the place where the Hukum Tajwid words are joined without the Tanween. Some students
[and I know quite a few] have trouble, in the beginning, trying to combine two
words without the “nn” sound in between. They end up “leaning on” the laam or
raa and saying them as though there is a shaddah on these two letters. However,
there isn’t.
But here yourself may protest that there is. Look at the
example above. There is a shaddah on the laam in both events for the words
likulli and lumazah. This shaddah is not there for shaddah purposes. It has
been put there as a sign to the reader that the Tanween (or Noon Saakinah) is
not to be pronounced at all, not even through the nasal passage.