রিয়াদুস সালেহীন ১৭২

A man came to the Prophet (ﷺ) and said: "As-Salamu 'Alaikum (May peace be upon you). The Messenger of Allah (ﷺ) responded to his greeting and the man sat down. The Prophet (ﷺ) said, "Ten (meaning the man had earned the merit of ten good deeds)." Another one came and said: "As-Salamu 'Alaikum wa Rahmatullah (May peace be upon you and the Mercy of Allah)." The Messenger of Allah (ﷺ) responded to his greeting and the man sat down. The Messenger of Allah (ﷺ) said, "Twenty." A third one came and said: "As-Salamu 'Alaikum wa Rahmatullahi wa Barakatuhu (May peace be upon you and the Mercy of Allah and His Blessings)." The Messenger of Allah (ﷺ) responded to his greeting and the man sat down. The Messenger of Allah (ﷺ) said, "Thirty.".

Anas (May Allah be pleased with him) reported the Prophet (ﷺ) used to repeat his words thrice so that the meaning thereof would be fully understood, and whenever he came upon a gathering of people, he would greet them. He would repeat Salam thrice..

We used to reserve for the Prophet (ﷺ) his share of the milk, and he would come at night and offer greetings in such a manner as did not disturb those asleep and was heard only by those who were awake. In fact, the Prophet (ﷺ) came and offered greetings as usual..