Musnad Ahmad 1013:42

'Abdullah ibn al-Harith narrated to us, al-Aslami—meaning 'Abdullah ibn 'Amir—narrated to me, from 'Imran ibn Abi Anas, from Sahl ibn Sa'd, who said: When the Messenger of Allah (peace and blessings of Allah be upon him) was asked about the mosque which was founded on piety, he said: "It is my mosque." 'Abdullah narrated to us, Yahya ibn Ma'in narrated to us, Hisham ibn Yusuf narrated to us, from Ma'mar; and my father narrated to us, 'Ali ibn Bahr narrated to us, Hisham ibn Yusuf narrated to us, Ma'mar narrated to us, from Abu Hazim, from Sahl ibn Sa'd, that the Prophet (peace and blessings of Allah be upon him) said: "Seventy thousand of my nation will enter Paradise," or he said: "Seven hundred thousand, without account."