The Messenger of Allah ﷺ said, "My Lord has granted me seventy thousand of my community who will enter Paradise without reckoning."Umar said, "Messenger of Allah, why did you not ask Him for more?"He replied, "I did ask Him for more, and He granted me along with each man another seventy thousand."Umar said, "Why did you not ask Him for still more?"He replied, "I asked Him for more, and He granted me this much," and Abdullah bin Bakr opened his hands wide before him. Abdullah said, he stretched out his arms, and Abdullah scooped with his hands. Hisham said, and this is from Allah, its number is unknown.
حدثنا عبد الله بن بكر السهمي حدثنا هشام بن حسان عن القاسم بن مهران عن موسى بن عبيد عن ميمون بن مهران
أن رسول الله ﷺ قال إن ربي أعطاني سبعين ألفا من أمتي يدخلون الجنة بغير حساب فقال عمر يا رسول الله فهلا استزدته قال قد استزدته فأعطاني مع كل رجل سبعين ألفا قال عمر فهلا استزدته قال قد استزدته فأعطاني هكذا وفرج عبد الله بن بكر بين يديه وقال عبد الله وبسط باعيه وحثا عبد الله وقال هشام وهذا من الله لا يدرى ما عدده
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Its chain of transmission is daif. Abdullah bin Bakr bin Habib Sahmi is trustworthy and reliable. Qasim bin Mihran is unknown, I found no criticism or endorsement of him, and that is why Dhahabi said in al-Mizan, "He is not known," and neither Bukhari nor Ibn Abu Hatim gave him an entry. There are others who are also named Qasim bin Mihran, but this is not one of them. Musa bin Ubayd was declared unknown by Husayni as quoted from him in al-Tajil 415, but Bukhari gave him an entry in al-Kabir 4/1/291 and mentioned no criticism of him. Maymun bin Mihran al-Jazari al-Raqqi is trustworthy, from the first generation of the followers.The hadith appears in Majma al-Zawaid 10:410-411, where it is stated, "Ahmad and Bazzar narrated it in similar wording, and Tabarani narrated it in similar wording, and in their chains is Qasim bin Mihran, from Musa bin Ubayd. This Musa bin Ubayd is the freed slave of Khalid bin Abdullah bin Usayd, and Ibn Hibban mentioned him among the trustworthy narrators. As for Qasim bin Mihran, Dhahabi mentioned him in al-Mizan and stated that no one narrated from him except Sulaym bin Amr al-Nakhai, but that is not correct, for Hisham bin Hassan also narrated this hadith from him. The rest of its chain consists of narrators relied upon in the Sahih."I say, this same rebuttal of Dhahabi also appears in al-Tahdhib, and it does resolve the uncertainty over the identity of Qasim bin Mihran, but it does not, in my view, resolve the uncertainty over his reliability. See hadith 22 in Musnad Abu Bakr.