Abu Hurairah reported,

We were sitting with the Prophet ﷺ when Surah al-Jumuah was revealed to him. When he recited "And others among them who have not yet joined them" [Jumuah 62:3], a man asked, "Messenger of Allah, who are these people?"The Prophet ﷺ did not respond to him until he had asked once, twice, or three times. Salman Farsi was among us. The Prophet ﷺ then placed his hand on Salman and said, "If faith were at the Pleiades, some men from these people would still reach it."

Muslim 6498

Sahih

حدثنا قتيبة بن سعيد حدثنا عبد العزيز يعني ابن محمد عن ثور عن أبي الغيث

عن أبي هريرة قال

كنا جلوسا عند النبي ﷺ إذ نزلت عليه سورة الجمعة فلما قرأ {وآخرين منهم لما يلحقوا بهم} قال رجل من هؤلاء يا رسول الله فلم يراجعه النبي ﷺ حتى سأله مرة أو مرتين أو ثلاثا قال وفينا سلمان الفارسي قال فوضع النبي ﷺ يده على سلمان ثم قال لو كان الإيمان عند الثريا لناله رجال من هؤلاء

مسلم 6498صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Virtues of the Companions, may Allah be pleased with them
Chapter
Virtue of Persia
Numbering
Darussalam 6498
Muslim 6498