Musnad Ahmad 26:414

'Abd al-Samad narrated to us, Hammam narrated to us, he said: 'Asim narrated to us, from Zirr, from Ibn Mas'ud, that the nations were presented to the Prophet, may Allah bless him and grant him peace. He said: So his nation was presented to him, and their great number pleased him. It was said: "Indeed, with these are seventy thousand who will enter Paradise without reckoning."