Musnad Ahmad 805:1

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah narrating from 'Alqamah ibn 'Abdullah al-Muzani, from men among the companions of the Prophet, may Allah bless him and grant him peace, that he said: "Whoever believes in Allah and the Last Day, let him fear Allah and honor his neighbor. And whoever believes in Allah and the Last Day, let him fear Allah and honor his guest. And whoever believes in Allah and the Last Day, let him fear Allah and speak the truth, or remain silent."