Sayyidina Abu Hurayrah reported that when surah al-Jumu’ah was revealed, we were with Allah’s Messenger. So he recited it. When he came to the word: "And (also for) others of them who have not yet joined them. And He is the Mighty, the Wise." (62 : 3) A man said to him, “O Messenger of Allah, who are they who have not joined us?” But, he did not give an answer. The narrator said that Salman was among them. Allah’s Messenger (SAW) put his hand on Salman and said, “By Him in Whose Hand is my soul, if faith was in the Star Thurayya (Pleiades), men from these people would bring it.”
[Ahmed 9410, Bukhari 4897, Muslim 21546]