Question
  Assalamu'alaykum,
  
  I have always wondered, how do we make wasl from the last letter of the huruf
  muqatta'ah when continuing to the next sentence? Do we have to read with
  ithhar in all of them?
  
  For example, Kaaf Ha Yaa 'Aieen, Saad dhikru rahmati rabbik..  how do we
  continue from Saad to dhikru? Do you have a recording to exemplify this case?
  JazakAllahu khairan.
   
  
  Answer
  Wa alaikum
  assalaam wa rahmatu Allahi wa barakatuh.
  The normal way
  for joining the individual separated letters at the beginning of some surahs
  with the words that follow them is with the sukoon on the last letter of the
  separated letters, since they are all with a sukoon, and continue reading. 
  There are a few places in the Qur’an that we have to take special
  note, because of grammar rules in addition to 
  the tajweed rules of the way we are reciting, in this case Hafs ‘an
  ‘Aasim by the way of Ash-Shatibiyyah. 
  When joining
  aayah one of surah Aali ‘Imraan with the second aayah, 
  
   there is the meeting of two saakin letters, the last 
  
 of
  the separated letter 
  
, and the first 
  
 of
  the Glorious name of 
  
. 
   The Arabic language rule for two saakin letters meeting is
  therefore employed, and the last 
  
of the separated letter 
  
 acquires
  a incidental fat-hah.   See http://www.abouttajweed.com/121003.htm
  for more details about the rule.  The
  medd laazim then is allowed to be six, as the 
  
 is
  normally saakinah, or two, since there is now a vowel on it. 
  Please look at the second question and its answer in the following link
  for more explanation: http://www.abouttajweed.com/100803.htm
  .
  Hafs ‘an
  ‘Aasim by the way of Ash-Shaatibiyyah has 
  
 of
  the letter 
  
 following
  by a 
  
 when
  joining the 
  
 of
  the first aayah of Ya Seen to the 
  
 beginning
  the second ayyah 
  
, 
  and also makes 
  
 of
  the 
  
 of
  the first aayah of surah Al-Qalam with the following 
  
  
 in
  the same aayah. 
  
. 
  
  There would be an 
  
 of
  the 
  
 saakinah
  of the letter 
  
, if one joined the separate letters of
  the first aayah in surah An-Naml 
  
 with
  the first letter: 
  
 of
  the next word .
  All other
  letters are read with 
  
 of
  the last saakinah letter of the separated letters, including the first two
  aayaat of surah Maryam: 
  
 in
  the recitation of Hafs ‘an ‘Aasim. Of course we would observe the qalqalah
  of the saakin letter 
  
, the last letter of the
  written out letter 
  
 when
  stopping or continuing and joining the first and second aayah. 
  It would be difficult for us to find an audio sample of the joining the
  two aayaat, since most reciters would be out of breath after the long mudood. 
  There are some of the qira’aat that have idghaam of the 
  
 into
  the 
  
, when joining the two aayaat, but Hafs is not
  of them. This shows that it is not impossible to join the two aayaat and
  indeed some do.