In the name of Allah, the Gracious, the Merciful
Al-Nawawi records in his book Riyad us-Saliheen:
Thabit ibn Ad-Dahhak reported: The Messenger of Allah, peace and blessings be upon him, said:
وَلَعْنُ الْمُؤْمِنِ كَقَتْلِهِ وَمَنْ رَمَى مُؤْمِنًا بِكُفْرٍ فَهُوَ كَقَتْلِهِ
Cursing a believer is like killing him and charging a believer with unbelief is like killing him.
Source: Ṣaḥīḥ al-Bukhārī 5754, Grade: Muttafaqun Alayhi
Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
لَا يَنْبَغِي لِصِدِّيقٍ أَنْ يَكُونَ لَعَّانًا
It is not befitting the truthful that they curse others.
Source: Ṣaḥīḥ Muslim 2597, Grade: Sahih
Abu Ad-Darda reported: The Messenger of Allah, peace and blessings be upon him, said:
لَا يَكُونُ اللَّعَّانُونَ شُفَعَاءَ وَلَا شُهَدَاءَ يَوْمَ الْقِيَامَةِ
Those who invoke curses will not be intercessors or witnesses on the Day of Resurrection.
Source: Ṣaḥīḥ Muslim 2595, Grade: Sahih
Samrah ibn Jundab reported: The Messenger of Allah, peace and blessings be upon him, said:
لَا تَلَاعَنُوا بِلَعْنَةِ اللَّهِ وَلَا بِغَضَبِهِ وَلَا بِالنَّارِ
Do not invoke the curse of Allah, or his wrath, or the Hellfire.
Source: Sunan al-Tirmidhī 1976, Grade: Sahih
Abdullah ibn Mas’ud said: The Messenger of Allah, peace and blessings be upon him, said:
لَيْسَ الْمُؤْمِنُ بِالطَّعَّانِ وَلَا اللَّعَّانِ وَلَا الْفَاحِشِ وَلَا الْبَذِيءِ
The believer does not taunt others, he does not curse others, he does not use profanity, and he does not abuse others.
Source: Sunan al-Tirmidhī 1977, Grade: Sahih
Abu Ad-Darda reported: The Messenger of Allah, peace and blessings be upon him, said:
إِنَّ الْعَبْدَ إِذَا لَعَنَ شَيْئًا صَعِدَتْ اللَّعْنَةُ إِلَى السَّمَاءِ فَتُغْلَقُ أَبْوَابُ السَّمَاءِ دُونَهَا ثُمَّ تَهْبِطُ إِلَى الْأَرْضِ فَتُغْلَقُ أَبْوَابُهَا دُونَهَا ثُمَّ تَأْخُذُ يَمِينًا وَشِمَالًا فَإِذَا لَمْ تَجِدْ مَسَاغًا رَجَعَتْ إِلَى الَّذِي لُعِنَ فَإِنْ كَانَ لِذَلِكَ أَهْلًا وَإِلَّا رَجَعَتْ إِلَى قَائِلِهَا
Verily, when a servant curses something, the curse rises to the heaven and the gates of heaven close upon it. It turns right and left and if it does not find somewhere to go, it will return to that which was cursed only if it deserved to be curse; otherwise, the curse will return to the one who made it.
Source: Sunan Abī Dāwūd 4905, Grade: Hasan
Imran ibn Hussein reported: We were with the Messenger of Allah during some of his travels and a woman from the Ansar was on a camel and she abused it and cursed it. When he heard that, the Messenger of Allah, peace and blessings be upon him, said:
خُذُوا مَا عَلَيْهَا وَدَعُوهَا فَإِنَّهَا مَلْعُونَةٌ
Unload the camel and set it free, for verily, it has been cursed.
Source: Ṣaḥīḥ Muslim 2595, Grade: Sahih
Abu Barzah Nadlah reported: A young woman was riding a camel on which was the people’s luggage. When she saw the Messenger of Allah and the pass of the mountain became narrow, the young woman said to the camel, “Go ahead.” When it did not move, she said, “O Allah, curse it!” The Messenger of Allah, peace and blessings be upon him, said:
لَا تُصَاحِبْنَا نَاقَةٌ عَلَيْهَا لَعْنَةٌ
A camel that has been cursed should not accompany us.
Source: Ṣaḥīḥ Muslim 2596, Grade: Sahih
Success comes from Allah, and Allah knows best.