Musnad Ahmad 30:3417

Yazid narrated to us, Ismail informed us, from Ziyad al-Makhzumi, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "We are the last, the first on the Day of Resurrection. The first group of my nation to enter Paradise will be seventy thousand, upon whom there is no reckoning. The appearance of every man among them is like the appearance of the moon on the night of the full moon. Then those who follow them are like the most intense light of a star in the sky. Then, after that, they are in ranks."