In the name of Allah, the Most Gracious, the Most Merciful
Mu’adh ibn Jabal, RadhiAllahu Anhu, reported: He said, “O Messenger of Allah, instruct me.” The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
اعْبُدِ اللَّهَ كَأَنَّكَ تَرَاهُ وَاعْدُدْ نَفْسَكَ فِي الْمَوْتَى وَإِنْ شِئْتَ أَنْبَأْتُكَ بِمَا هُوَ أَمْلَكُ بِكَ مِنْ هَذَا كُلِّهِ
Worship Allah as if you can see him and prepare yourself for death. If you wish, I will tell you what should be reined in more than all of that.
The Prophet, SallAllahu Alayhi Wa Sallam, pointed to his tongue and he said:
هَذَا
It is this.
Source: al-Ṣamt li Ibn Abī Dunyā 22, Grade: Jayyid
Abu Sa’id al-Khudri, RadhiAllahu Anhu, reported: The Prophet, SallAllahu Alayhi Wa Sallam, said:
إِذَا أَصْبَحَ ابْنُ آدَمَ فَإِنَّ الْأَعْضَاءَ كُلَّهَا تُكَفِّرُ اللِّسَانَ فَتَقُولُ اتَّقِ اللَّهَ فِينَا فَإِنَّمَا نَحْنُ بِكَ فَإِنْ اسْتَقَمْتَ اسْتَقَمْنَا وَإِنْ اعْوَجَجْتَ اعْوَجَجْنَا
When the son of Adam wakes up in the morning, all of his limbs defer to the tongue and they say: Fear Allah regarding us, for we are only a part of you. If you are upright, we are upright. If you are crooked, we are crooked.
Source: Sunan al-Tirmidhī 2407, Grade: Sahih
Abdullah ibn Mas’ud, RadhiAllahu Anhu, reported: The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
أَكْثَرُ خَطَايَا ابنِ آدَمَ فِي لِسَانِهِ
Most of the sins of the children of Adam are on their tongues.
And Ibn Mas’ud, may Allah be pleased with him, said:
يَا لِسَانُ قُلْ خَيْرًا تَغْنَمْ وَاسْكُتْ عَنْ شَرٍّ تَسْلَمْ مِنْ قَبْلِ أَنْ تَنْدَمَ
O tongue! Speak goodness and be rewarded, or remain silent and be safe, lest you become regretful.
Source: al-Mu’jam al-Kabīr 10300, Grade: Sahih
Abu Bakr, RadhiAllahu Anhu, reported: The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
لَيْسَ شَيْءٌ مِنَ الْجَسَدِ إِلا وَهُوَ يَشْكُو ذَرَبَ اللِّسَانِ
There is no limb on the body but that it complains of the sharpness of the tongue.
Source: Musnad Abī Ya’lá 5, Grade: Sahih
Abdullah ibn Amr, RadhiAllahu Anhu, reported: The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
مَنْ صَمَتَ نَجَا
Whoever is silent has been saved.
Source: Sunan al-Tirmidhī 2501, Grade: Sahih
Abu Huraira, RadhiAllahu Anhu, reported: The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
إِنَّ الْعَبْدَ لَيَتَكَلَّمُ بِالْكَلِمَةِ يَنْزِلُ بِهَا فِي النَّارِ أَبْعَدَ مَا بَيْنَ الْمَشْرِقِ وَالْمَغْرِبِ
Verily, the servant may speak a single word for which he plummets into the Hellfire farther than the distance between East and West.
Source: Ṣaḥīḥ al-Bukhārī 6112, Grade: Muttafaqun Alayhi
In another narration, the Prophet, SallAllahu Alayhi Wa Sallam, said:
إِنَّ الْعَبْدَ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ رِضْوَانِ اللَّهِ لَا يُلْقِي لَهَا بَالًا يَرْفَعُهُ اللَّهُ بِهَا دَرَجَاتٍ وَإِنَّ الْعَبْدَ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ سَخَطِ اللَّهِ لَا يُلْقِي لَهَا بَالًا يَهْوِي بِهَا فِي جَهَنَّمَ
Verily, a servant may speak a word pleasing to Allah, thinking nothing of it, yet by it Allah raises his status by a degree. Verily, a servant may speak a word displeasing to Allah, thinking nothing of it, yet by it he plummets into Hell.
Source: Ṣaḥīḥ al-Bukhārī 6113, Grade: Sahih
Bilal ibn al-Harith, RadhiAllahu Anhu, reported: The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
إِنَّ أَحَدَكُمْ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ رِضْوَانِ اللَّهِ مَا يَظُنُّ أَنْ تَبْلُغَ مَا بَلَغَتْ فَيَكْتُبُ اللَّهُ لَهُ بِهَا رِضْوَانَهُ إِلَى يَوْمِ يَلْقَاهُ وَإِنَّ أَحَدَكُمْ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ سَخَطِ اللَّهِ مَا يَظُنُّ أَنْ تَبْلُغَ مَا بَلَغَتْ فَيَكْتُبُ اللَّهُ عَلَيْهِ بِهَا سَخَطَهُ إِلَى يَوْمِ يَلْقَاهُ
Verily, one of you speaks a word pleasing to Allah, thinking it does not amount to much, yet by it Allah decrees his pleasure with him until the day he meets him. Verily, one of you speaks a word displeasing to Allah, thinking it does not amount to much, yet Allah decrees his displeasure with him until the day he meets him.
Source: Sunan al-Tirmidhī 2319, Grade: Sahih
Al-Mughirah ibn Sha’bah, RadhiAllahu Anhu, reported: The Prophet, SallAllahu Alayhi Wa Sallam, said:
إِنَّ اللَّهَ حَرَّمَ عَلَيْكُمْ عُقُوقَ الْأُمَّهَاتِ وَمَنْعًا وَهَاتِ وَوَأْدَ الْبَنَاتِ وَكَرِهَ لَكُمْ قِيلَ وَقَالَ وَكَثْرَةَ السُّؤَالِ وَإِضَاعَةَ الْمَالِ
Verily, Allah has forbidden you from disobeying your mothers, withholding charity, demanding from others, and burying your daughters alive. Allah disapproves that you spread talebearing and gossip, ask many unnecessary questions, and waste your wealth.
Source: Ṣaḥīḥ al-Bukhārī 5630, Grade: Muttafaqun Alayhi
Ali ibn Husayn, RadhiAllahu Anhu, reported: The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
إِنَّ مِنْ حُسْنِ إِسْلَامِ الْمَرْءِ تَرْكَهُ مَا لَا يَعْنِيهِ
Verily, part of perfection in Islam is for a person to leave what does not concern him.
Source: Sunan al-Tirmidhī 2318, Grade: Sahih li ghayri
Anas, RadhiAllahu Anhu, reported: A man among the companions of the Prophet passed away and another man said, “Receive glad tidings of Paradise!” The Messenger of Allah, SallAllahu Alayhi Wa Sallam, said:
أَوَلَا تَدْرِي فَلَعَلَّهُ تَكَلَّمَ فِيمَا لَا يَعْنِيهِ أَوْ بَخِلَ بِمَا لَا يَنْقُصُهُ
Certainly, you do not know for sure! Perhaps he spoke of what does not concern him, or he was miserly with what would not disadvantage him.
Source: Sunan al-Tirmidhī 2316, Grade: Sahih li ghayri
Success comes from Allah, and Allah knows best.