Musnad Ahmad 31:601

Zakariya ibn 'Adi narrated to us, 'Ubayd Allah—meaning Ibn 'Amr—informed us, from 'Abd Allah ibn Muhammad ibn 'Aqil, from Hamzah ibn Abi Sa'id al-Khudri, from his father, who said: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying upon the pulpit: "What is the matter with people who say that the kinship of the Messenger of Allah, may Allah bless him and grant him peace, will not benefit on the Day of Resurrection? By Allah, my kinship is connected in this world and the Hereafter. And I, O people, am a forerunner for you at the Basin (al-Hawd)."