Musannaf Ibn Abi Shayba 27:77

'Affan narrated to us, he said: 'Abd al-Wahid ibn Ziyad narrated to us, he said: al-Harith ibn al-Husayn narrated to us, he said: al-Qasim ibn 'Abd al-Rahman narrated to us, from his father, from 'Abdullah ibn Mas'ud, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "How will you be when you are a quarter of the people of Paradise, for you is its quarter, and for the rest of the people is its three quarters?" He said: So they said: "Allah and His Messenger know best." He said: "How will you be when you are a third of it?" They said: "That is much." He said: "How will you be when you are half of it?" They said: "That is more." Then the Messenger of Allah (may Allah bless him and grant him peace) said: "The people of Paradise on the Day of Resurrection are one hundred and twenty rows; you are eighty rows."