Ubaidullah ibn Said
أبو قدامة عبيد الله بن سعيد بن يحيى
Fourth generation, died 241 AH in Nisapur. Named in the chains of 93 narrations of the library, 11 in Bukhari, 14 in Muslim, 64 in Nasa'i.
93narrations name him
5collections
241 AHhe died, in Nisapur
In the books of narrators: Trustworthy, ثقة مأمون سني.