It is narrated from Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) that he said: "I heard the Prophet (peace and blessings be upon him) saying: 'Every Ummah has a trustworthy one, and indeed the trustworthy one of this Ummah is Sayyiduna Abu Ubaydah bin al-Jarrah (may Allah be pleased with him).'"
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Abu Bakr (may Allah be pleased with him) except with this chain, and al-Zubayr bin Abbad al-Madini (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 6463
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه محمد بن الحسن بن زبالة متروك
Hadith Takhrij«قال الهيثمي: فيه محمد بن الحسن بن زبالة وهو متروك «مجمع الزوائد ومنبع الفوائد، ج 9، ص 155»» «أخرجه الحاكم فى «المستدرك» برقم: 5200»