Which surah is this? How to find the ayah being recited

To find which surah is being recited, the quickest way is to let a Quran recognition app listen for 10 seconds: it names the surah, the ayah and its juz and page. If you can't use one, catch a few distinctive Arabic words and type them into a Quran search. Refrains, prophets' names, the opening letters of a surah and the context of the prayer narrow it down further.

Way 1: let an app listen

Apps such as Samee work like a song-recognition app, but for the Quran.

1. Open the app and hold your phone towards the sound: a loudspeaker, a radio, a laptop.
2. Let it listen for 10 seconds, or 15 for a live imam or a noisy room.
3. Read the surah and ayah range, with the juz and page of the standard 604-page mushaf.

Two things make this work for any voice. A recording of a well-known reciter is matched exactly against a catalogue of recordings. Any other voice, your imam's included, is recognised from the words it says, which are then found in the Quran. How it does that is explained in identifying a Quran recitation.

If the recitation is in a video or voice note, save it and identify the file instead. In Samee that's Identify a file; it reads the first 30 seconds, so trim a long file to the part you want (how).

Way 2: search the words you caught

You don't need the whole ayah. Three or four consecutive words are often enough, and vowel marks don't matter.

1. Write down the words you heard, in Arabic if you can. Even approximate spelling helps.
2. Paste them into a Quran search, such as the search on quran.com.
3. Check each result by listening to the ayah, or reading the next words.

Which words to catch:

• Names: موسى، إبراهيم، فرعون، مريم، يوسف. A name narrows the search to a few surahs.
• Unusual words or phrases: a rare word appears in only a handful of places.
• The end of an ayah: endings rhyme within a passage, and the rhyme (-ūn, -īn, -ā) tells you something about where you are.

Avoid searching only for very common phrases, such as إِنَّ اللَّهَ or يَا أَيُّهَا الَّذِينَ آمَنُوا, which appear in many places.

Way 3: use the clues in the recitation

Even without a phone or a search, the recitation carries clues.

Refrains

Some surahs repeat a line that gives them away at once:

Openings

Twenty-nine surahs open with separate letters, such as Alif Lam Mim, Ta Ha, Ya Sin or Qaf. If you heard the very beginning, those letters narrow the choice: Ta Ha and Ya Sin each open only one surah.

Length of the ayahs

Long ayahs with legal or narrative detail point to the long surahs near the start of the mushaf, such as Al-Baqara and An-Nisa. Short, rhythmic ayahs with strong rhyme are typical of the last juz, Juz 'Amma, which is also the part most often recited in the shorter prayers.

The prayer itself

• Taraweeh: many mosques recite the Quran in order across Ramadan, about one juz a night, so the night of Ramadan is a rough guide to the juz.
• Fajr on Friday: many imams recite As-Sajdah and Al-Insan, following a well-known report in Sahih al-Bukhari and Sahih Muslim.
• The Friday prayer: Al-A'la and Al-Ghashiyah, or Al-Jumu'ah and Al-Munafiqun, are common, following reports in Sahih Muslim.

These are habits, not rules, so use them as a starting point and confirm with the words.

When two places sound alike

The Quran contains many passages that are similar but not identical, called mutashabihat. The story of Musa, for instance, is told in several surahs with small differences of wording. If an app or a search gives you two or three candidates:

• listen to the next ayah, which usually differs;
• note the words around the shared phrase;
• compare the candidates side by side in the mushaf.

Hifz students know this problem well, because the same passages make memorisers jump from one surah to another. If you're memorising, it's worth marking these places in your own mushaf.

Finding the place in your mushaf

Once you know the surah and ayah, the juz and page take you straight to it in a printed copy. Samee shows them under every result, for example Juz 29, page 562, using the 604-page Madani mushaf found in most mosques. Mushafs printed in South Asia often have a different page count, so use the surah and ayah there.

When it isn't Quran at all

Not everything recited in Arabic in a mosque is Quran. The adhan and iqamah, the takbir, du'a after the prayer, the qunoot in Witr, a nasheed or a hadith won't be found in a Quran search, and a recognition app won't match them to an ayah. Samee, for example, labels the takbir, Amin and the qunoot as not Quran text while following a prayer.

Then what?

Knowing the place is the start. You can follow the rest of the recitation word by word, listen to it again by a reciter you like, or add it to your memorisation. In Samee, Follow along from here and Practise this ayah are right under the result; see read the identify result.