I asked Abu Abdullah (as), about an oath for a mute person if a debt is claimed against him and the claimant has no evidence. Imam (as) said: "Commander of the Faithful, peace be upon him, was once brought a case involving a mute person against whom a debt was claimed. The mute denied it, and the claimant had no evidence. Commander of the Faithful, peace be upon him, said: 'Praise be to Allah (swt), who did not take me from this world until I clarified for the nation all that it needs.' Then Imam Ali ibn Abi Talib (as) said: 'Bring me a copy of the Quran.' When it was brought, Imam Ali ibn Abi Talib (as) said to the mute: 'What is this?' The mute raised his head toward the sky and gestured that it was the Book of Allah (swt). Then Imam Ali ibn Abi Talib (as) said: 'Bring me his guardian.' They brought his brother, and Imam Ali ibn Abi Talib (as), seated him next to the mute. Then Imam Ali ibn Abi Talib (as) said: 'O Qanbar, bring me ink and a plate.' When they were brought, Imam Ali ibn Abi Talib (as) said to the mute's brother: 'Say to your brother that this matter between him and the claimant is a matter of truth.' Then Commander of the Faithful, peace be upon him, wrote: 'By Allah (swt), besides whom there is no god, Knower of the unseen and the seen, the Most Merciful, the Most Compassionate, the Overpowering, the Victorious, the One who brings harm and benefit, the Destroyer, the All-Knowing-who knows what is hidden and what is apparent-indeed, the claimant (mentioning his name) has no right or claim against (mentioning the mute's name) in any form or through any cause.' Then Imam Ali ibn Abi Talib (as) washed the writing and ordered the mute to drink it. The mute refused, so Commander of the Faithful, peace be upon him, ruled that the debt was binding upon him."