Musnad Ahmad 28:259

Yunus and Abu Salamah al-Khuza'i narrated to us, they said: Layth narrated to us, from Yazid—meaning Ibn al-Had—from 'Amr ibn Shu'ayb, from his father, from his grandfather, that he heard the Prophet, may Allah bless him and grant him peace, saying: "Shall I not inform you of those of you most beloved to me and closest to me in seating on the Day of Resurrection?" The people remained silent, so he repeated it two or three times. The people said: "Yes, O Messenger of Allah." He said: "Those of you with the best character."