✅ Answer: Please reflect on the following narrations:

1 الْأَعْمَشِ عَن جَعْفَرِ بْنِ مُحَمَّدٍ فِي حَدِيثِ شَرَائِعِ الدِّينِ قَالَ: وَ الْإِجْهَارُ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ فِي الصَّلَاةِ وَاجِبٌ

📚 Khisal p. 604

Translation: Imam Sadiq (peace be upon him) said in the hadith of the laws of religion: It is obligatory to recite Bismillah al-Rahman al-Rahim audibly and loudly in prayer.

2 الْفَضْلِ بْنِ شَاذَانَ عَن الرِّضَا في كِتَابِهِ إِلَى الْمَأْمُونِ قَالَ: وَ الْإِجْهَارُ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ فِي جَمِيعِ الصَّلَوَاتِ سُنَّةٌ

📚 'Uyun Akhbar al-Reza Vol. 2, p. 123

Translation: Imam Reza (peace be upon him) said in his letter to Ma'mun (may Allah's curse be upon him): It is a tradition to recite Bismillah al-Rahman al-Rahim audibly and loudly in all prayers.

3 رَجَاء بْن أَبِي الضَّحَّاك عَنِ الرِّضَا أَنَّهُ كَانَ يَجْهَرُ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ فِي جَمِيعِ صَلَوَاتِهِ بِاللَّيْلِ وَ النَّهَارِ

📚 'Uyun Akhbar al-Reza Vol. 2, p. 182

Translation: Raja' ibn Abi al-Dhahhak narrated that Imam Reza (peace be upon him) used to recite Bismillah al-Rahman al-Rahim loudly and audibly in all the prayers of the night and day.

4 أَبِي حَفْصٍ الصَّائِغِ قَالَ: صَلَّيْتُ خَلْفَ جَعْفَر بْن مُحَمَّد فَجَهَرَ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيم

📚 Amali Tusi Vol. 1, p. 279

Abu Hafs said: I prayed behind Imam Sadiq (peace be upon him) and he recited Bismillah al-Rahman al-Rahim loudly and audibly.

5 عَنْ صَفْوَانَ الْجَمَّالِ قَالَ: صَلَّيْتُ خَلْفَ أَبِي عَبْدِ اللَّهِ أَيَّاماً فَكَانَ إِذَا كَانَتْ صَلَاةٌ لَا يُجْهَرُ فِيهَا جَهَرَ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ وَ كَانَ يَجْهَرُ فِي السُّورَتَيْنِ جَمِيعاً

📚 Kafi Vol. 3, p. 315

Translation: Safwan said: I prayed behind Imam Sadiq (peace be upon him) for several days, and when it was a prayer that was not recited audibly (meaning it was the Dhuhr and 'Asr prayers), he would say Bismillah al-Rahman al-Rahim loudly and audibly, and in both surahs (meaning both in Al-Hamd and in the surah after Al-Hamd), he would recite Bismillah al-Rahman al-Rahim audibly and loudly.

6 رُوِيَ عَنْ أَبِي مُحَمَّدٍ الْحَسَنِ بْن عَلِيٍّ الْعَسْكَرِيِّ أَنَّهُ قَالَ:عَلَامَاتُ الْمُؤْمِنِ خَمْسٌ صَلَاةُ الْخَمْسِينَ وَ زِيَارَةُ الْأَرْبَعِينَ و التَّخَتُّمُ فِي الْيَمِينِ و تَعْفِيرُ الْجَبِينِ و الْجَهْرُ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ

📚 Tahdhib Vol. 2, p. 289

Translation: Hanan said: I prayed behind Imam Sadiq (peace be upon him), and the Imam recited the ta'awwudh (he said 'A'udhu billahi min al-shaytan al-rajim') audibly and loudly, and then he also recited Bismillah al-Rahman al-Rahim audibly and loudly.

7 حنان بْن سدير قال:صَلَّيْتُ خَلْفَ أَبِي عَبْدِ اللَّهِ فَتَعَوَّذَ بِإِجْهَارٍ ثُمَّ جَهَرَ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ

✅ As is clear from the above narrations, the audible and loud recitation of Bismillah al-Rahman al-Rahim is not specific to obligatory prayers, but is for prayer in general, and in all the prayers of the night and day, this noble verse, both in Surah Al-Hamd and in all the surahs that a person recites in the obligatory or supererogatory prayer after Surah Al-Hamd, is recited audibly and loudly.

✅ In the prayer that is recited as one or two rak'ahs to compensate for some doubts in prayer and is known today as 'Salat al-Ihtiyat,' Bismillah al-Rahman al-Rahim is also recited audibly, and there is no narrative evidence to exclude it. And those who have said that as a precaution, Bismillah al-Rahman al-Rahim in this 'Salat al-Ihtiyat' should be recited in a whisper have spoken contrary to the narrative texts. Therefore, in all the prayers of the night and day, Bismillah al-Rahman al-Rahim is recited audibly and loudly.

✅سنت بودن جهر به بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ در حدیث 2 منافاتی با واجب بودن آن در حدیث1 ندارد زیرا طبق فرموده اهل بیت علیهم السلام برخی از سنت ها، واجب هستند:(عَنْ عَلِیٍّ علیه السلام أَنَّهُ قَالَ: السُّنَّةُ سُنَّتَانِ سُنَّةٌ فِی فَرِیضَةٍ الْأَخْذُ بِهَا هُدًی وَ تَرْکُهَا ضَلَالَةٌ وَ سُنَّةٌ فِی غَیْرِ فَرِیضَةٍ الْأَخْذُ بِهَا فَضِیلَةٌ وَ تَرْکُهَا إِلَی غَیْرِ خَطِیئَةٍ📚بحار ج2ص264)