Sahih al-Bukhari 6244

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).

إِذَا سَلَّمَ سَلَّمَ ثَلاَثًا، وَإِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا‏.‏

Narrated by Anas ibn 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."

كَانَ إِذَا سَلَّمَ سَلَّمَ ثَلاَثًا وَإِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا ‏.‏

Narrated by Anas ibn Mālik

Whenever the Prophet (ﷺ) said something, he would repeat his words thrice so that the meanings would be understood fully; and whenever he came upon a group of people, he would greet them, and he would repeat salutation thrice. [Al-Bukhari].

عن أنس رضي الله عنه أن النبى صلى الله عليه وسلم كان إذا تكلم بكلمة أعادها ثلاثاً حتى تفهم عنه، وإذا أتى على قومٍ فسلم عليهم سلم عليهم ثلاثاً‏.‏ ‏(‏‏(‏رواه البخاري‏)‏‏)‏‏.‏

Narrated by Anas ibn Mālik + 3 other versions

that the Messenger of Allah (ﷺ) would repeat a statement three times so that it could be understood.

يُعِيدُ الْكَلِمَةَ ثَلاَثًا لِتُعْقَلَ عَنْهُ ‏

Narrated by Anas ibn Mālik + 1 other version

AbuSallam said on the authority of a man who served the Holy Prophet (ﷺ) that whenever he talked, he repeated it three times.

إِذَا حَدَّثَ حَدِيثًا أَعَادَهُ ثَلاَثَ مَرَّاتٍ ‏.‏