Allah Almighty says: "They said: We are missing the measuring bowl of the king, and for whoever brings it there is a camel's load (of grain as a reward), and I am its guarantor." [Surah Yusuf: 72]
And He said: "Ask them which of them is a guarantor for that (claim)." [Surah al-Qalam: 40]
It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The one who gives a guarantee is liable for its payment." Imam al-Muzani (may Allah have mercy on him) said: "Al-za'im" in the language means "al-kafil" (the surety).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحوالة / 11392