A man came after the Messenger of Allah ﷺ had already prayed. The Prophet ﷺ said, "Who among you will earn a reward by trading with this man?" So a man stood up and prayed with him.In another narration, "Who will give charity to this man by praying with him?"In another narration, Abu Bakr gave him the charity and prayed with him.
جاء رجل وقد صلى رسول الله ﷺ فقال: أيكم يتجر على هذا؟ فقام رجل فصلى معه. وفي رواية: ألا من يتصدق على هذا فيصلي معه وفي رواية: فتصدق عليه أبو بكر فصلى معه.
Abu Dawud (574) and Tirmidhi (220) narrated it, with the wording here belonging to Tirmidhi, both of them through Sulayman Aswad Naji Basri, from Abu Mutawakkil, from Abu Saeed, who mentioned something similar.Tirmidhi said, This is a hasan hadith, and it is the view of more than one of the scholars among the companions of the Prophet ﷺ and other Followers, who said, There is no harm in a group praying in congregation in a masjid where a congregation has already prayed. This is the view held by Ahmad and Ishaq. Others among the scholars said, They should pray individually. This is the view held by Sufyan, Ibn Mubarak, Malik, and Shafii, who preferred praying individually. Sulayman Naji was from Basra, and he is also said to be Sulayman bin Aswad. Abu Mutawakkil's name is Ali bin Dawud. End of Tirmidhi's statement.The hadith is hasan, as Tirmidhi said, for Sulayman bin Aswad Naji was "truthful," and he was deemed reliable by Ibn Main and Ibn Hibban. Abu Mutawakkil, who is also well known by his kunya as Naji, whose name is Ali bin Dawud, also said to be Ibn Duad, with a damma on the dal, was a trustworthy Follower.This hadith was also recorded by Ibn Khuzayma (1632), Ibn Hibban (11019), and Hakim (1/209), who said, "sahih according to the criterion of Muslim, though the two of them did not record it." He said that this Sulayman Aswad is Sulayman bin Suhaym, whom Muslim relied on, along with Abu Mutawakkil, and that this hadith is a foundational text regarding establishing congregation in masjids twice. End of that.But Sulayman here is not Ibn Suhaym, Abu Ayub Madani, for whom Muslim narrated, rather he is Sulayman Aswad Naji, one of the men found in Abu Dawud and Tirmidhi.Hafiz Haythami cited it in Majma al-Zawaid (2185) and attributed it to Ahmad, and this is its wording, From Abu Saeed Khudri, who said, The Messenger of Allah ﷺ led his companions in the Dhuhr prayer. Then a man from among his companions came in, and the Prophet ﷺ said to him, "What kept you from the prayer, so-and-so?" He mentioned something he used as an excuse. He then stood to pray, and the Messenger of Allah ﷺ said, "Will no man show charity to this one by praying with him?" So a man stood up and prayed with him.Haythami said, Ahmad narrated it, and Abu Dawud and Tirmidhi narrated part of it, and its narrators are the narrators of the sahih works.I say, Imam Ahmad narrated it (11808) from Ali bin Asim, who said, Sulayman Naji informed us of it with this same wording, just as he also narrated it from Muhammad bin Abu Adi, from Saeed, meaning Ibn Abu Aruba, (11019), and from Muhammad bin Jafar, who said, Saeed narrated to us, (11408), and from Affan, who said, Wahib narrated to us, (11613). All of these narrators, I mean Ali bin Asim, Saeed bin Abu Aruba, and Wahib, who is Ibn Khalid Bahili, narrated it from Sulayman Aswad, and we have already explained that he is not among the narrators of Muslim. Also, Ali bin Asim was not narrated from by either of the two sheikhs at all. And in his version of the hadith there is an addition, namely the Prophet's saying ﷺ, "What kept you from the prayer, so-and-so?" to which he replied, for this addition has not been corroborated.Ali bin Asim Wasiti Tamimi, their client, was described by Ali bin Madini as follows, He made many mistakes. Aqeeli said, We know him for lying. Bukhari said, He is not strong. Ajli, however, deemed him reliable.As for the man who prayed with him, he was Abu Bakr Siddiq, as narrated by Ibn Abu Shayba (2/277) as a mursal report from Hasan.