Musnad Ahmad 27:1003

Mu'ammar ibn Sulayman al-Raqqi Abu 'Abd Allah narrated to us, Ziyad ibn Khaythama narrated to us, from 'Ali ibn al-Nu'man ibn Qurad, from a man, from 'Abd Allah ibn 'Umar, from the Prophet, peace and blessings of Allah be upon him, who said: "I was given the choice between intercession or that half of my nation enter Paradise, so I chose intercession, because it is more general and more sufficient. Do you think it is for the purified? No, but it is for the defiled, the sinners." Ziyad said: "As for it, it is a grammatical error (lahn), but this is how the one who narrated it to us narrated it."