✅ Answer: Consider the following two narrations regarding this matter:

عَنْ سُلَيْمَانَ بْنِ حَفْصٍ الْمَرْوَزِيِّ قَالَ: قَالَ الْفَقِيهُ الْعَسْكَرِيُّ يَجِبُ عَلَى الْمُسَافِرِ أَنْ يَقُولَ فِي دُبُرِ كُلِّ صَلَاةٍ يُقَصِّرُ فِيهَا- سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ ثَلَاثِينَ مَرَّةً لِتَمَامِ الصَّلَاةِ.

📚 Tahdhib, Vol. 3, p. 230

Translation: Suleiman ibn Hafs Marwazi says: Imam Askari (peace be upon him) said: It is obligatory for a traveler to say thirty times after every shortened prayer to complete the prayer:

سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ

✅عَنْ رَجَاءِ بْنِ أَبِي الضَّحَّاكِ عَنِ الرِّضَا أَنَّهُ صَحِبَهُ فِي سَفَرٍ فَكَانَ يَقُولُ بَعْدَ كُلِّ صَلَاةٍ يَقْصُرُهَا- سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ ثَلَاثِينَ مَرَّةً وَ يَقُولُ هَذَا تَمَامُ الصَّلَاةِ.

📚 Uyun Akhbar al-Reza, Vol. 2, p. 182

Translation: Raja ibn Abi Dahhak, who accompanied Imam Reza (peace be upon him) from Medina to Merv, says: The Imam (peace be upon him) would say thirty times after every shortened prayer:

سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ

And he would say: This completes the prayer.

✅ The above two narrations indicate that a traveler should recite the Tasbihat Arba’a after shortened prayers, and it is appropriate to act according to their apparent meaning, as we are not permitted to apply personal opinion in this regard.

✅ Generally, reciting the Tasbihat Arba’a after prayers carries immense reward for everyone, but it is specifically deemed necessary for a traveler. Consider the following narration as well:

عَنْ أَبِي بَصِيرٍ قَالَ: قَالَ أَبُو عَبْدِ اللَّهِ إِنَّ رَسُولَ اللَّهِ قَالَ لِأَصْحَابِهِ ذَاتَ يَوْمٍ أَ رَأَيْتُمْ لَوْ جَمَعْتُمْ مَا عِنْدَكُمْ مِنَ الثِّيَابِ وَ الْآنِيَةِ ثُمَّ وَضَعْتُمْ بَعْضَهُ عَلَى بَعْضٍ أَ تَرَوْنَهُ يَبْلُغُ السَّمَاءَ قَالُوا لَا يَا رَسُولَ اللَّهِ فَقَالَ يَقُولُ أَحَدُكُمْ إِذَا فَرَغَ مِنْ صَلَاتِهِ- سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ ثَلَاثِينَ مَرَّةً وَ هُنَّ يَدْفَعْنَ الْهَدْمَ وَ الْغَرَقَ وَ الْحَرَقَ وَ التَّرَدِّيَ فِي الْبِئْرِ وَ أَكْلَ السَّبُعِ وَ مِيتَةَ السَّوْءِ وَ الْبَلِيَّةَ الَّتِي نَزَلَتْ عَلَى الْعَبْدِ فِي ذَلِكَ الْيَوْمِ وَ هُنَّ الْبَاقِيَاتُ الصَّالِحَاتُ

📚 Thawab al-A’mal, p. 26

📚 Ma’ani al-Akhbar, p. 324

Translation: Imam Sadiq (peace be upon him) said: One day, the Messenger of Allah (peace be upon him and his family) said to his companions: Tell me, if you gathered all your clothes and vessels and stacked them, would they reach the sky? They said: No, O Messenger of Allah. He said: When one of you finishes the prayer and says thirty times:

سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ

These recitations ward off collapse of walls, drowning, fire, falling into a well, being devoured by a predator, a bad death, and calamities that may befall a servant on that day, and they are among the enduring righteous deeds.

✅ Other narrations also highlight the virtue of reciting these recitations after prayers and at other times.

عَنِ الْحَارِثِ بْنِ الْمُغِيرَةِ النَّضْرِيِّ قَالَ سَمِعْتُ أَبَا عَبْدِ اللَّهِ ع يَقُولُ مَنْ قَالَ سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ أَرْبَعِينَ مَرَّةً فِي دُبُرِ كُلِّ صَلَاةٍ فَرِيضَةٍ قَبْلَ أَنْ يَثْنِيَ رِجْلَيْهِ ثُمَّ سَأَلَ اللَّهَ أُعْطِيَ مَا سَأَلَ.

📚 Amali Saduq, p. 154

Translation: Harith says: I heard Imam Sadiq (peace be upon him) say: Whoever says forty times after an obligatory prayer before moving their feet:

سُبْحَانَ اللَّهِ وَ الْحَمْدُ لِلَّهِ وَ لَا إِلَهَ إِلَّا اللَّهُ وَ اللَّهُ أَكْبَرُ

Then asks Allah for something, it will be granted to them.

✅ In some narrations, reciting these is considered among the instances of abundant remembrance (dhikr kathir) commanded in the Holy Quran.