Musnad Ahmad 32:1641

Qutaybah ibn Sa'id narrated to us, Rashdin ibn Sa'd narrated to us, from Qurrah, from Ibn Shihab, from Anas ibn Malik: That the Prophet, may Allah bless him and grant him peace, said: "Whoever loves for Allah to expand his provision for him and to postpone his term (of life), let him maintain the ties of kinship."