The Messenger of Allah ﷺ said, "Allah has promised me that seventy thousand of my community will enter Paradise without any reckoning."Yazid bin Akhnas al-Sulami remarked, "By Allah, those are no more in your community than reddish flies among ordinary flies!"The Messenger of Allah ﷺ replied, "My Lord has indeed promised me seventy thousand, and with every thousand another seventy thousand, and He has granted me three handfuls more."
أن رسول الله ﷺ قال: إن الله وعدني أن يدخل من أمتي الجنة سبعين ألفا بغير حساب. فقال يزيد بن الأخنس السلمي: والله ما أولئك في أمتك إلا كالذباب الأصهب في الذبان! فقال رسول الله ﷺ: فإن ربي قد وعدني سبعين ألفا، مع كل ألف سبعون ألفا، وزادني ثلاث حثيات.
Ahmad (22156) and Ibn Hibban (7246) both narrated it through Safwan bin Amr, from Salim bin Amir Khabairi and Abu Yaman Hawzani, from Abu Umama, who mentioned it. Its chain is sahih. His saying, "With every thousand, seventy thousand," is an addition from Allah following the Prophet's ﷺ request for more, as in the hadith that follows.