Zakariyya narrates from al-Sha'bi (may Allah have mercy on him) that death came to a Muslim man at the place called "Daquqa", and there was no Muslim present to witness his will. So he took two People of the Book as witnesses. They came to Kufah, to al-Ash'ari (may Allah be pleased with him), informed him, and brought his estate and his will. Al-Ash'ari (may Allah be pleased with him) said: This is a matter that has not occurred since the one that happened in the time of the Messenger of Allah (peace and blessings be upon him). He made the two of them swear by Allah after the Asr prayer that they had not betrayed, lied, altered, concealed or changed anything, and that this was the man's will and his estate. Thus he enforced their testimony.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20626