بدأت الباحثة بحثها بالترجمة لأسامة بن زيد الليثي، فذكرت اسمه ونسبه، ونسبته، وكنيته، ثم شيوخه، وتلاميذه، وبينت درجة شيوخه وتلاميذه من خلال ترتيبهم على مراتب من حيث الوصف بثقة فما دونها. ثم ذكرت طبقته، ثم وفاته، ثم من أخرج له من أصحاب الكتب الستة، وبينت أن البخاري استشهد به في رواية واحدة، وأن مسلما روى له في الشواهد والمتابعات، ولم يحتج به. ثم ذكرت أقوال علماء الجرح والتعديل في أسامة بن زيد، فبدأت بذكر أقوال المعدلين، ثم المجرحين، ثم ناقشت الأقوال التي تحتاج لمناقشة وبيان، وبينت الراجح من أقوال العلماء، وخلاصة القول فيه، وانتهت إلى أنه حسن الحديث. The researcher began her study by translating for Osama bin Zaid al-Laythi, mentioning his name, lineage, nickname, as well as his teachers and students. She detailed the ranks of his teachers and students based on their descriptions with confidence and below. Then she mentioned his social status, his death, and listed those who narrated from him among the authors of the six major books. She highlighted that Al-Bukhari cited him in one narration, while Muslim narrated from him in corroborative and consecutive chains without hesitation. She then discussed the opinions of scholars specializing in evaluating the reliability of narrators regarding Osama bin Zaid, starting with the moderate views, then moving on to the critical ones. She addressed opinions requiring further discussion and clarification, presented the most accepted views among scholars, summarized the discussion, and concluded that he was reliable in narrating hadiths.