'Imran bin Husain (May Allah be pleased with them) reported:
A man came to the Prophet ﷺ and said: "As-Salamu 'Alaikum (may you be safe from evil). 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 acts)." Another one came and said: "As-Salamu 'Alaikum wa Rahmatullah (may you be safe from evil, and Mercy of Allah be upon you)." Messenger of Allah ﷺ responded to his greeting and the man sat down. Messenger of Allah ﷺ said, "Twenty." A third one came and said: "As-Salamu 'Alaikum wa Rahmatullahi wa Barakatuhu (may you be safe from evil, and the Mercy of Allah and His Blessings be upon you)." Messenger of Allah ﷺ responded to his greeting and the man sat down. Messenger of Allah ﷺ said, "Thirty."

[Abu Dawud and At-Tirmidhi].

عن عمران بن الحصين رضي الله عنهما قال: جاء رجل إلى النبي ﷺ فقال: السلام عليكم، فرد عليه 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” ((رواه أبو داود والترمذي وقال: حديث حسن)).