A man came to the Prophet ﷺ and said, "Peace be upon you."The Prophet ﷺ returned the greeting, and the man sat down.The Prophet ﷺ said, "Ten."Then another man came and said, "Peace be upon you and the mercy of Allah."The Prophet ﷺ returned his greeting, and the man sat down.The Prophet ﷺ said, "Twenty."Then another man came and said, "Peace be upon you and the mercy of Allah and His blessings."The Prophet ﷺ returned his greeting, and the man sat down.The Prophet ﷺ said, "Thirty."
حدثنا محمد بن كثير أخبرنا جعفر بن سليمان عن عوف عن أبي رجاء
جاء رجل إلى النبي ﷺ فقال السلام عليكم فرد عليه السلام ثم جلس فقال النبي ﷺ عشر ثم جاء آخر فقال السلام عليكم ورحمة الله فرد عليه فجلس فقال عشرون ثم جاء آخر فقال السلام عليكم ورحمة الله وبركاته فرد عليه فجلس فقال ثلاثون
[Its chain of transmission is hasan] Tirmidhi narrated it in Kitab al-Istidhan, chapter on what has been mentioned regarding the excellence of the greeting of peace, hadith 2689, from Muhammad bin Kathir with this chain, and he said, hasan sahih ghareeb.