Salam,
My Question is about the sound of Noon in Kalimah-e-Shahdah whether it is Ashadu (AN La ilaha) IL Lallah OR Ashadu (AL La Ilaha) Il Lallah.
Same Question is for End Ayah of Surah Ikhlas is that which one is right, Walam Ya KUN Lahoo kufOan Ahad or Walam Ya KUL Lahoo KufOan Ahad ? please reply me ASAP I'll be thankful to you.
Answer
Wa alaikum assalaam wa rahmatullahi wa barakatuh,
In classical Arabic, which included Qur'an recitation, if there is a
saakinah (meaning it has no vowel) followed by a 
, the merges completely into the , and the becomes emphasized (meaning it has a shaddah). In the case of the kalimah, you have a saakinah followed by a in: "an laa". We cannot say it is required to say the kalimah with the merging, because we are not talking about the Qur'an, but if one wishes to say it in proper Arabic as they would say it at the time of the Prophet, peace and blessings of Allah upon him, it would be said with the merging of the into the so that nothing is heard of the noon at all. If one doesn't do this though, it is not invalid. The same rule applies to surah Al-IkhlaaS, aayaah 4 on the words yakun lahu (not in red),
, but this is the Qur'an, so we should make every effort to read it correctly with the merging, because the Qur'an was revealed with tajweed. To read it correctly, the saakinah of yakun merges completely into the of lahu, the is emphasized and nothing is heard of the . Please also see:
http://www.abouttajweed.com/the-noon-saakinah-and-tanween/merging-of-the-noon-saakinah-and-tanween-p-2.html
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You are welcome