Hadith 25:293
Hafs narrated to us, from Ash'ath, from al-Hasan, who said: They are two witnesses from the Muslims; their testimony is permissible against all of the heirs.
حدثنا حفص عن أشعث عن الحسن قال هما شاهدان من المسلمين تجوز شهادتهما على الورثة كلهم