Musnad Abu Ya'la al-Mawsili 151:76

Bishr ibn al-Walid narrated to us, Sharik narrated to us, from al-Rukin ibn al-Rabi', from his father, from Abdullah, who attributed it to the Prophet (may Allah bless him and grant him peace), who said: "Usury, even if it is much, its end results in scarcity."