It is narrated from Sayyiduna Abu Sa'id al-Anmari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, my Lord has promised me that He will admit seventy thousand people of my Ummah into Paradise without reckoning, and every one thousand will intercede for a further seventy thousand; then my Lord will scoop three handfuls with His two hands."
Qays (may Allah have mercy on him) said: I asked Sayyiduna Abu Sa'id (may Allah be pleased with him): "Did you hear this from the Messenger of Allah (peace and blessings be upon him)?" He replied: "Yes, I heard it with (my own) ears, and my heart retained it."
Sayyiduna Abu Sa'id (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "And this (number), if Allah wills, will take in the Muhajirun of my Ummah, and Allah, the Mighty and Majestic, will make up the rest of it from our Bedouins."
This hadith is narrated from Sayyiduna Abu Sa'id al-Anmari (may Allah be pleased with him) only with this chain, and Mu'awiyah bin Sallam (may Allah have mercy on him) is alone in narrating it.
In the printed edition of Dar al-Haramayn it is like this (Abdullah bin Ulayyah), and probably the correct (name) is (Abdullah bin Amir), as in Majma' al-Bahrayn; and Allah knows best.
Hadith Referenceالمعجم الأوسط / باب الألف / 404
Hadith Gradingمحدثین:رجاله ثقات، وعلته الاختلاف في سنده
Hadith Takhrij«قال الهيثمي: فيه أبو سعيد الأنماري ورجاله ثقات «مجمع الزوائد ومنبع الفوائد، ج 10، ص 409»» «قال ابن حجر: علته الاختلاف في سنده «فتح الباري شرح صحيح البخاري، ج 11، ص 418»» «أخرجه الطبراني فى «الكبير» برقم: 771، 772»