Question

Assalamu Aleikum.
I have a question regarding the hiding of the noon.  I know that when the fatha with tanween is followed by the letter "Waw", the tanween is merged into
the letter which is one of the rules for the hiding. During the celebration of Eid, there is one Du'a that has this sentence: " ...Wa subhana llâhi bukrata(n) wa assila.." Some were saying with the proper rule which is: "bukrataw wa assila" (the merging) however I heard others pronouncing the noon such as : "bukratan wa assila." I would like to know: are both pronunciations correct? In other words,  is pronouncing either "bukrataw" or "bukratan" allowed in Tajweed?
May Allah reward you in finding the answers inshallah.
Ma Salam

Answer

Wa alaikum assalaam wa rahmatu Allahi wa barakatuh.

In recitation of the Qur’an when there is a  saakinah, which includes the tanween with any vowel, followed by the letter , there is a merging of the  saakinah into the , with an accompanying ghunnah, such as in: .  This is in reading the Qur’an. 

When it comes to other things such as dua’ or the talbiyah, etc. it is not the same as the stress of importance in reading with tajweed rules or proper classical Arabic.  Allah knows best.  Of course, if one makes the idghaam etc, they are doing well, since this is correct classical Arabic.  See also the following: http://63.175.194.25/index.php?ln=eng&ds=qa&lv=browse&QR=21561&dgn=4