Answer
✅Answer: Pay attention to the following narrations:
1 عن عبید بن زرارة قال: قُلْتُ لِأَبِی عبداللَّه قَوْلَهُ عَزَّوَجَلَّ فَمَنْ شَهِدَ مِنْکُمُ الشَّهْرَ فَلْیَصُمْهُ قَالَ مَا أَبْیَنَهَا مَنْ شَهِدَ فَلْیَصُمْهُ و مَنْ سَافَرَ فَلَا یَصُمْهُ
📚 Al-Kafi, vol. 4, p. 126
'Ubayd said: I said to Imam Sadiq (peace and blessings of Allah be upon him): 'What is the meaning of the words of Allah (the Exalted and Glorious) (in Surah Al-Baqarah, verse 185) which say: 'So whoever is present (in his hometown) during this month, he must fast it'?' The Imam said: 'How clear that is! Whoever is present and in his hometown fasts it, and whoever travels does not fast it!'
📚 Faqih, vol. 2, p. 139
2 عن الحلبی عن أَبِی عبداللَّه قال: سَأَلْتُهُ عَنِ الرَّجُلِ یَدْخُلُ شَهْرُ رَمَضَانَ و هُوَ مُقِیمٌ لَا یُرِیدُ بَرَاحاً ثُمَّ یَبْدُو لَهُ بَعْدَ مَا یَدْخُلُ شَهْرُ رَمَضَانَ أَنْ یُسَافِرَ فَسَکَتَ فَسَأَلْتُهُ غَیْرَ مَرَّةٍ فَقَالَ یُقِیمُ أَفْضَلُ إِلَّا أَنْ یَکُونَ لَهُ حَاجَةٌ لَا بُدَّ لَهُ مِنَ الْخُرُوجِ فِیهَا أَوْ یَتَخَوَّفَ عَلَی مَالِه
Halabi said: I asked Imam Sadiq (peace and blessings of Allah be upon him) about a person who is a resident when the month of Ramadan begins and he does not intend to travel. Then, after the month of Ramadan has started, he decides to travel. The Imam was silent, and I asked him several times! The Imam said: 'If he stays in his city, it is better, unless he has a need for which he must travel, or he fears for his wealth!'
📚 Faqih, vol. 2, p. 139
3 عن محمد بن مسلم عن أَبی جَعْفَر أَنَّهُ سُئِلَ عَنِ الرَّجُلِ یَعْرِضُ لَهُ السَّفَرُ فِی شَهْرِ رَمَضَانَ وَ هُوَ مُقِیمٌ و قَدْ مَضَی مِنْهُ أَیَّامٌ فَقَالَ لَا بَأْسَ بِأَنْ یُسَافِرَ وَ یُفْطِرَ وَ لَا یَصُوم
Imam Baqir (peace and blessings of Allah be upon him) was asked about a person who is a resident when Ramadan begins, and a few days have passed, and a journey comes up for him. The Imam said: 'There is no problem for him to travel and to break his fast and not fast!'
📚 Al-Kafi, vol. 4, p. 126
4 عن أَبِی بَصِیر قال : سَأَلْتُ أَبَا عَبْداللَّه عَنِ الْخُرُوجِ إِذَا دَخَلَ شَهْرُ رَمَضَانَ فَقَالَ لَا إِلَّا فِیمَا أُخْبِرُکَ بِهِ خُرُوجٍ إِلَی مَکَّةَ أَوْ غَزْوٍ فِی سَبِیلِ اللَّهِ أَوْ مَالٍ تَخَافُ هَلَاکَهُ أَوْ أَخٍ ترید وداعه وَ إِنَّهُ لَیْسَ أَخاً مِنَ الْأَبِ وَ الْأُمِّ
Abu Basir said: I asked Imam Sadiq (peace and blessings of Allah be upon him) about traveling after the month of Ramadan has begun. The Imam said: 'No! Except in what I will tell you: a journey to Mecca, or a jihad in the way of Allah, or for wealth that you fear will be destroyed, or a brother whom you intend to bid farewell, and this brother is not a blood relative!'
📚 Al-Khisal, p. 614
5 عن عَلِیٍّ فِی حَدِیثِ الْأَرْبَعِمِائَةِ قال: لَیْسَ لِلْعَبْدِ أَنْ یَخْرُجَ إِلَی سَفَرٍ إِذَا حَضَرَ شَهْرُ رَمَضَان لِقَوْلِ اللَّهِ عَزَّوَجَلَّ فَمَنْ شَهِدَ مِنْکُمُ الشَّهْرَ فَلْیَصُمْهُ
Imam 'Ali (peace and blessings of Allah be upon him) said: 'It is not for a servant to travel when the month of Ramadan arrives, because of the divine words that say: 'So whoever among you is present during the month of Ramadan must fast it'!'
📚 Tahdhib, vol. 4, p. 216
6 عن رَجُلٍ عَنْ أَبِی عَبْداللَّه قال: إِذَا دَخَلَ شَهْرُ رَمَضَانَ فَلِلَّهِ فِیهِ شَرْطٌ قَالَ اللَّهُ تَعَالَی فَمَنْ شَهِدَ مِنْکُمُ الشَّهْرَ فَلْیَصُمْهُ فَلَیْسَ لِلرَّجُلِ إِذَا دَخَلَ شَهْرُ رَمَضَانَ أَنْ یَخْرُجَ إِلَّا فِی حَجٍّ أَوْ فِی عُمْرَةٍ أَوْ مَالٍ یَخَافُ تَلَفَهُ أَوْ أَخٍ یَخَافُ هَلَاکَهُ وَ لَیْسَ لَهُ أَنْ یَخْرُجَ فِی إِتْلَافِ مَالِ أَخِیهِ فَإِذَا مَضَتْ لَیْلَةُ ثَلَاثٍ وَ عِشْرِینَ فَلْیَخْرُجْ حَیْثُ شَاء
Imam Sadiq (peace and blessings of Allah be upon him) said: 'When the month of Ramadan begins, there is a condition for Allah in it! Allah Almighty says: 'Whoever among you is present during the month of Ramadan must fast it!' So when the month of Ramadan arrives, a person cannot travel except for Hajj or 'umrah, or for wealth that he fears will be destroyed, or a brother whose destruction he fears. And it is not for him to travel for the destruction of his brother's wealth. So when the night of the twenty-third of Ramadan has passed, he can go out to wherever he wants!'
✅ According to the above narrations and others, when the month of Ramadan arrives, it is forbidden and disliked to travel except for the cases that have been permitted in the above narrations and others, although a general permission for it has also been reported. And this prohibition is lifted after the night of the 23rd of Ramadan has passed.
اللَّهُمَّ صَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ و النَّصْر