Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bukhari:94ʿAbdah > ʿAbd al-Ṣamad > ʿAbdullāh b. al-Muthanná > Thumāmah b. ʿAbdullāh > Anas

Whenever the Prophet ﷺ asked permission to enter, he knocked the door thrice with greeting and whenever he spoke a sentence (said a thing) he used to repeat it thrice. (See Hadith No. 261, Vol. 8).  

البخاري:٩٤حَدَّثَنَا عَبْدَةُ قَالَ حَدَّثَنَا عَبْدُ الصَّمَدِ قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُثَنَّى قَالَ حَدَّثَنَا ثُمَامَةُ بْنُ عَبْدِ اللَّهِ عَنْ أَنَسٍ

عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ إِذَا سَلَّمَ سَلَّمَ ثَلاَثًا وَإِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا  


See similar narrations below:

Collected by Bukhārī, Tirmidhī, Aḥmad, Ḥākim
bukhari:95ʿAbdah b. ʿAbdullāh > ʿAbd al-Ṣamad > ʿAbdullāh b. al-Muthanná > Thumāmah b. ʿAbdullāh > Anas

Whenever the Prophet ﷺ spoke a sentence (said a thing), he used to repeat it thrice so that the people could understand it properly from him and whenever he asked permission to enter, (he knocked the door) thrice with greeting.  

البخاري:٩٥حَدَّثَنَا عَبْدَةُ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا عَبْدُ الصَّمَدِ قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُثَنَّى قَالَ حَدَّثَنَا ثُمَامَةُ بْنُ عَبْدِ اللَّهِ عَنْ أَنَسٍ

عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ إِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا حَتَّى تُفْهَمَ عَنْهُ وَإِذَا أَتَى عَلَى قَوْمٍ فَسَلَّمَ عَلَيْهِمْ سَلَّمَ عَلَيْهِمْ ثَلاَثًا  

bukhari:6244Isḥāq > ʿAbd al-Ṣamad > ʿAbdullāh b. al-Muthanná > Thumāmah b. ʿAbdullāh > Anas

Whenever Messenger of Allah ﷺ greeted somebody, he used to greet him three times, and if he spoke a sentence, he used to repeat it thrice.  

البخاري:٦٢٤٤حَدَّثَنَا إِسْحَاقُ أَخْبَرَنَا عَبْدُ الصَّمَدِ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُثَنَّى حَدَّثَنَا ثُمَامَةُ بْنُ عَبْدِ اللَّهِ عَنْ أَنَسٍ ؓ

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا سَلَّمَ سَلَّمَ ثَلاَثًا وَإِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا  

tirmidhi:2723Isḥāq b. Manṣūr > ʿAbd al-Ṣamad b. ʿAbd al-Wārith > ʿAbdullāh b. al-Muthanná > Thumāmah b. ʿAbdullāh b. Anas b. Mālik > Anas b. Mālik

"When the Messenger of Allah ﷺ would give the Salam he would do so three times, and when he would say a statement, he would say it three times."  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Ṣaḥīḥ-Gharīb.
الترمذي:٢٧٢٣حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ أَخْبَرَنَا عَبْدُ الصَّمَدِ بْنُ عَبْدِ الْوَارِثِ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُثَنَّى حَدَّثَنَا ثُمَامَةُ بْنُ عَبْدِ اللَّهِ بْنِ أَنَسِ بْنِ مَالِكٍ عَنْ أَنَسِ بْنِ مَالِكٍ

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا سَلَّمَ سَلَّمَ ثَلاَثًا وَإِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ
ahmad:13221ʿAbd al-Ṣamad > ʿAbdullāh b. al-Muthanná > Thumāmah > Anas

"When the Messenger of Allah ﷺ would give the Salam he would do so three times, and when he would say a statement, he would say it three times." (Using translation from Tirmidhī 2723)   

أحمد:١٣٢٢١حَدَّثَنَا عَبْدُ الصَّمَدِ حَدَّثَنَا عَبْدُ اللهِ بْنُ الْمُثَنَّى عَنْ ثُمَامَةَ عَنْ أَنَسٍ

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا تَكَلَّمَ بِكَلِمَةٍ رَدَّدَهَا ثَلَاثًا وَإِذَا أَتَى قَوْمًا فَسَلَّمَ عَلَيْهِمْ عَلَيْهِمْ سَلَّمَ ثَلَاثًا  

hakim:7716Abū Bakr Ismāʿīl b. Muḥammad b. Ismāʿīl Bi-al-Rray > Abū Ḥātim > Muḥammad b. ʿAbdullāh b. al-Muthanná al-Anṣārī from my father > Thumāmah > Anas b. Mālik

"When the Messenger of Allah ﷺ would give the Salam he would do so three times, and when he would say a statement, he would say it three times." (Using translation from Tirmidhī 2723)   

الحاكم:٧٧١٦حَدَّثَنَا أَبُو بَكْرٍ إِسْمَاعِيلُ بْنُ مُحَمَّدِ بْنِ إِسْمَاعِيلَ بِالرَّيِّ ثَنَا أَبُو حَاتِمٍ ثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ الْمُثَنَّى الْأَنْصَارِيُّ حَدَّثَنِي أَبِي ثَنَا ثُمَامَةُ عَنْ أَنَسِ بْنِ مَالِكٍ

«أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلَاثًا لِتُعْقَلَ عَنْهُ»  

هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ الشَّيْخَيْنِ وَلَمْ يُخَرِّجَاهُ أخرجه البخاري سوى قوله لتعقل عنه