✅ Answer: Please refer to the following narrations:

1⃣عَنْ عِدَّةٍ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِیَادٍ عَنْ عَلِیِّ بْنِ أَسْبَاطٍ عَنِ الْحَسَنِ بْنِ کُلَیْبٍ عَنْ أَبِی عَبْدِ اللَّهِ قَالَ: ضَحِکُ الْمُؤْمِنِ تَبَسُّمٌ.

📚 Al-Kafi, vol. 2, p. 664

Imam Sadiq (peace be upon him) said: The laughter of a believer is a smile!

2⃣عَنْ عَلِیِّ بْنِ إِبْرَاهِیمَ عَنْ أَبِیهِ عَنِ ابْنِ أَبِی عُمَیْرٍ عَنْ حَمَّادٍ عَنِ الْحَلَبِیِّ عَنْ أَبِی عَبْدِ اللَّهِ قَالَ: الْقَهْقَهَةُ مِنَ الشَّیْطَانِ.

📚 Al-Kafi, vol. 2, p. 664

Imam Sadiq (peace be upon him) said: Loud laughter (i.e., intense and loud laughter) is from Satan!

3⃣عَنْ مُحَمَّدِ بْنِ یَحْیَی عَنْ عَبْدِ اللَّهِ بْنِ مُحَمَّدٍ عَنْ عَلِیِّ بْنِ الْحَکَمِ عَنْ أَبَانِ بْنِ عُثْمَانَ عَنْ خَالِدِ بْنِ طَهْمَانَ عَنْ أَبِی جَعْفَرٍ قَالَ: إِذَا قَهْقَهْتَ فَقُلْ حِینَ تَفْرُغُ اللَّهُمَّ لَا تَمْقُتْنِی.

📚 Al-Kafi, vol. 2, p. 664

Imam Baqir (peace be upon him) said: If you laugh out loud, when you finish, say: اللَّهُمَّ لَا تَمْقُتْنِی

which means: O Allah! Do not despise me!

4⃣فِي حَدِيثِ هَمَّامٍ قَالَ أَمِيرُ الْمُؤْمِنِينَ في صفة المؤمن : وَ إِنْ ضَحِكَ لَمْ يَعْلُ صَوْتُهُ

📚 Bihar al-Anwar, vol. 67, p. 316

In the Hadith of Hammam, the Commander of the Faithful (peace be upon him) described the believer, saying: (The believer) does not raise his voice when he laughs!

5⃣عَنْ إِبْرَاهِيمَ بْنِ الْعَبَّاسِ قَالَ مَا رَأَيْتُ أَبَا الْحَسَنِ الرِّضَا جَفَا أَحَداً بِكَلَامِهِ إِلَى أَنْ قَالَ وَ لَا رَأَيْتُهُ يُقَهْقِهُ فِي ضِحْكِهِ قَطُّ بَلْ كَانَ ضِحْكُهُ التَّبَسُّمَ الْخَبَرَ

📚 Uyun Akhbar al-Ridha (peace be upon him), vol. 2, p. 184, hadith 7

Ibrahim ibn Abbas said: I never saw Imam Ridha (peace be upon him) offend anyone with his speech... and he also said: I never saw him laugh loudly; his laughter was always a smile!

✅ 'Tabassum' in lexical books is considered the first level of 'al-dihk' and means 'smile', 'silent laughter', and 'showing the teeth at the beginning of laughter'.

'Qahqaha' refers to 'repeated loud laughter', 'intense laughter', 'loud laughter', and 'boisterous laughter'.

✅ According to the above narrations, the laughter of a believer is a smile, and loud laughter is from Satan. If someone falls into loud laughter, it is recommended to say afterwards: اللَّهُمَّ لَا تَمْقُتْنِی, which means: O Allah! Do not despise me.

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

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