Riyad as-SalihinChapter 1Hadith 16
Full Sharh — Riyad as-Salihin 16
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)).
English Translation
Anas (May Allah be pleased with him) reported:: 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. .
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Good Manners
Hadith Number
16