Jami At Tirmidhi
2723
Hasan Sahih+3

Narrated Anas bin Malik:"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

Hasan SahihAhmad Muhammad Shakir
Hasan SahihAl-Albani