I recently saw on an Islamic channel that there are 4 circumstances in surah anfal in particular i believe were the term ana as part of a word or its own has to be elongated otherwise the resulting recitation amounts to kufr.

Question
Assalamu Alaikum. I recently saw on an Islamic channel that there are 4 cirucumstances in surah anfal in particular i believe were the term ana as part of a word or its own has to be elongated otherwise the resulting recitation amounts to kufr. As you are aware there are several occasions in the Qur'an where the word ana appears. I believe it to mean "I". The rule is despite there being an aliph/hamza near the letter nun it is not to be elongated whilst reciting. Now what I heard was there are instances when reciting the quran that this rule does not apply and failure to elongate the term ana to anaa either when it occurs on its own or as part of a longer word leads to kufr.

Could you please shed some more light on this?

Answer
Wa alaikum assalaam wa rahmatullahi wa barakatuh,
Since we did not see the program, we can only answer according to what we assume.
The word: is read without the alif when continuing in the reading of Hafs 'an 'Aasim in all places in the Qur'an, but when stopping on this word, all of the different qira'aat stop with an alif.  That is what the "zero" over the alif indicates. The stopping on this word with an alif is for the whole Qur'an, wherever this word occurs.  Please see: http://www.abouttajweed.com/stopping-on-the-ends-of-words/stopping-on-the-ends-of-words-with-weak-endi-3.html
When reviewing and looking over surah Al-Anfaal, we could not find an incidence of this word.
Of course when reading the Qur'an, we should do our best to apply the rules, and in this case, it is especially important when stopping on the word in the phrase: translated in meaning, There is no deity but I [Allah addressing mankind ].  If one stopped without the alif, the word would no long mean "I", and the meaning would be distorted. 
Having said that, if one made every effort to read correctly and accidently read it incorrectly stopping on the instead of the alif without believing that "an" was a deity, then there is no kufr since they did not read it this way intentionally and do not believe it and instead have firmly in the heart that the only deity or only thing worthy of worship is Allah.   Allah knows best.  Please refer to the PDF document with the ruling Imam ibn Al-Jazaree laid out for this: http://www.abouttajweed.com/downloads/useful-documents/why-should-we-read-the-quran-with-tajweed-/download.html, particularly the last page.
There are a few ways recitations in the different qira'aat that lengthen the alif in the word when continuing if a hamzah qata' follows it.  An example of this would be in the phrase:   .  We are giving this last information just for clarification since we are not sure what was said on the program.