Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: We were with the Prophet (peace and blessings be upon him) when this verse was revealed: "And among them are others who have not yet joined them." A man asked: O Messenger of Allah! Who are these people? The Prophet (peace and blessings be upon him) did not reply. The man repeated his question. Meanwhile, Sayyiduna Salman al-Farsi (may Allah be pleased with him) passed by, so the Prophet (peace and blessings be upon him) placed his hand on his shoulder and said: If faith were suspended at Thurayya (the Pleiades star), some people from his nation would attain it from there.
Hadith Referenceصحیح ابن حبان / كتاب إخباره ﷺ عن مناقب الصحابة رجالهم ونسائهم بذكر أسمائهم رضوان الله عليهم أجمعين / 7308
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الصحيحة» (1017): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح