✅ Answer: Please refer to the following narrations:

1⃣عَنْ أَبِی مُحَمَّدٍ هَارُونَ بْنِ مُوسَی عَنْ مُحَمَّدِ بْنِ عَلِیِّ بْنِ مَعْمَرٍ عَنْ مُحَمَّدِ بْنِ الْحُسَیْنِ بْنِ أَبِی الْخَطَّابِ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنِ الْمُفَضَّلِ بْنِ عُمَرَ عَنْ أَبِی عَبْدِ اللَّهِ أَنَّهُ قَالَ : تُصَلِّی فِی شَهْرِ رَمَضَانَ زِیَادَةَ أَلْفِ رَکْعَةٍ... إلی أَنْ قَالَ : ثُمَّ قَالَ یَا مُفَضَّلَ بْنَ عُمَرَ تَقْرَأُ فِی هَذِهِ الصَّلَوَاتِ کُلِّهَا أَعْنِی صَلَاةَ شَهْرِ رَمَضَانَ الزِّیَادَةَ مِنْهَا بِالْحَمْدِ وَ قُلْ هُوَ اللَّهُ أَحَدٌ إِنْ شِئْتَ مَرَّةً وَ إِنْ شِئْتَ ثَلَاثاً وَ إِنْ شِئْتَ خَمْساً وَ إِنْ شِئْتَ سَبْعاً وَ إِنْ شِئْتَ عَشْراً

📚 *Al-Tahdhib, Vol. 3, p. 66*: Mufaddal bin Omar said: Imam Sadiq (peace be upon him) said: In Ramadan, you pray an additional thousand rak'ahs... until he said: Then Imam Sadiq (peace be upon him) said: O Mufaddal bin Omar! In all of these prayers, that is, the additional prayers in Ramadan, you recite Surah Al-Fatiha (once) and Surah Al-Ikhlas (Qul Huwa Allahu Ahad), once if you wish, three times if you wish, five times if you wish, seven times if you wish, or ten times if you wish!

📚 *Al-Tahdhib, Vol. 3, p. 64*: Imam Sadiq (peace be upon him) said: In the first twenty nights of Ramadan, pray eight rak'ahs after Maghrib and twelve rak'ahs after Isha. Then on the night in which there is hope of reaching Laylat al-Qadr, pray one hundred rak'ahs, in each rak'ah reciting Surah Al-Ikhlas ten times! I said: May I be sacrificed for you! If I do not have the strength to stand? He said: Then pray while sitting! I said: If I do not have the strength to sit? He said: Then pray while lying on your back in bed!

2⃣عَنْ سَعْدَانَ بْنِ مُسْلِمٍ عَنْ أَبِی بَصِیرٍ قَالَ: قَالَ أَبُو عَبْدِ اللَّهِ صَلِّ فِی الْعِشْرِینَ مِنْ شَهْرِ رَمَضَانَ ثَمَانِیاً بَعْدَ الْمَغْرِبِ وَ اثْنَتَیْ عَشْرَةَ رَکْعَةً بَعْدَ الْعَتَمَةِ فَإِذَا کَانَتِ اللَّیْلَةُ الَّتِی یُرْجَی فِیهَا مَا یُرْجَی فَصَلِّ مِائَةَ رَکْعَةٍ تَقْرَأُ فِی کُلِّ رَکْعَةٍ قُلْ هُوَ اللَّهُ أَحَدٌ عَشْرَ مَرَّاتٍ قَالَ قُلْتُ جُعِلْتُ فِدَاکَ فَإِنْ لَمْ أَقْوَ قَائِماً قَالَ فَجَالِساً قُلْتُ فَإِنْ لَمْ أَقْوَ جَالِساً قَالَ فَصَلِّ وَ أَنْتَ مُسْتَلْقٍ عَلَی فِرَاشِکَ.

✅ Please refer to the following link also: https://t.me/porseshvapasokhe/683

✅ Based on the above narrations and others, in the additional Nafl prayers that are performed during Ramadan, after reciting Surah Al-Fatiha, it is recommended to recite Surah Al-Ikhlas either once, three times, five times, seven times, or ten times in each rak'ah.

اللَّهُمَّ صَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْر