Musnad Abu Ya'la al-Mawsili 152:290

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