Shurahbil bin Muslim Al-Khawlani said:
I heard Abu Umamah Al-Bahil say: "I heard the Messenger of Allah(ﷺ) say: "The guarantor is responsible and the debt must be repaid.' " (IT)
English reference (IT): Vol. 3, Book 15, Hadith 2405 (IT)
Arabic reference (IT): Book 15, Hadith 2497 (IT)