The Messenger of Allah ﷺ used to walk through the rows from one side to the other, touching our chests and shoulders and saying, "Do not stand unevenly, lest your hearts differ."He would also say, "Indeed, Allah and His angels send blessings upon the front rows."
كان رسول الله ﷺ يتخلل الصف من ناحية إلى ناحية، يمسح صدورنا ومناكبنا ويقول: لا تختلفوا فتختلف قلوبكم. وكان يقول: إن الله وملائكته يصلون على الصفوف الأول.
Abu Dawud (664) and Nasai (811) both narrated it through Abu Ahwas, from Mansur, from Talha bin Musarrif, from Abdul-Rahman bin Awsaja, from Bara, as mentioned. Ibn Hibban (2157) also related it through this same route. Ibn Majah (997) also narrated it through Shuba, who said, I heard Talha bin Musarrif say, I heard Abdul-Rahman bin Awsaja say, I heard Bara bin Azib, except that he did not mention the first part of the hadith. For this reason Busiri counted it among the additions (zawaid), and said, "Its isnad is sahih and its narrators are reliable." I say, the hadith does not actually meet the criteria for the zawaid, but it is sahih as he said. Ibn Khuzayma (1556) also graded it sahih, narrating it through Jareer, from Mansur, with the same wording.Abu Bakr Ibn Abu Shayba (351/1) narrated it from Abu Khalid Ahmar, from Hasan bin Ubaydullah, from Talha, with the wording, "Straighten your rows, and do not let the devils slip between you like the offspring of hazaf." It was asked, "O Messenger of Allah, what are the offspring of hazaf?" He said, "Black, hairless lambs found in the land of Yemen."Imam Ahmad narrated it in his Musnad (18518) from Affan, who said, Shuba narrated to us and said, Talha informed me of it, adding at the beginning of the hadith, "Whoever grants the loan of a milking animal, or lends silver, or guides someone along a road, or gives milk to drink, will have a reward equal to freeing a slave or a soul. And whoever says, 'There is no god but Allah alone, with no partner, His is the dominion and His is all praise, and He has power over all things,' ten times, will have a reward equal to freeing a slave or a soul."Baghawi narrated it in Sharh al-Sunnah (3/372) through Sufyan Thawri, from Amash, from Talha, with an addition, "Beautify the Quran with your voices, and whoever grants the loan of a milking animal, or guides someone along a road, will have it counted as charity."All of these narrations are sahih.As for what was narrated from Qatada, from Abu Ishaq Kufi, from Bara bin Azib, that the Prophet of Allah ﷺ said, "Allah and His angels send blessings upon the front row, and the muazzin is forgiven for the extent of his voice, and whoever hears him, whether moist or dry, confirms him and receives a reward like that of one who prayed with him," this is disconnected (munqati), though it appears connected on its surface. For this reason Munziri was deceived by it and said, "Its isnad is good (jayyid)." Targhib wa Tarhib (1/140). Hafiz mentioned in Talkhis (1/205) that Ibn Sakan had graded it sahih.Nasai (13/2) and Imam Ahmad (18506) both narrated it through the hadith of Muaz bin Hisham, who said, my father narrated to me, from Qatada, mentioning the same. Qatada, that is, Ibn Daama, is a mudallis, and he narrated with an ambiguous form (anana), and there is doubt about whether he actually heard from Abu Ishaq. Alai mentioned in Jami Tahsil (p. 256), quoting Bardiji, who said, "He narrated from Abu Ishaq, but I do not know whether he actually heard from him or not. What settles in the heart is that he did not hear from him."Ibn Adi narrated it in Kamil (2426/6), saying, Ibn Sayd narrated to us, Bundar and Bishr bin Adam narrated to us, both saying, Muaz bin Hisham narrated to us with it. He then said, "This is how Qatada narrated it, through the narration of Muaz bin Hisham, from him, from his father, from him, saying, from Abu Ishaq, from Bara, dropping two links between Abu Ishaq and Bara. For the companions of Abu Ishaq narrated it from Abu Ishaq, from Talha bin Musarrif, from Abdul-Rahman bin Awsaja, from Bara."I say, among the companions of Abu Ishaq is his own son Yusuf, who narrated it from his father Abu Ishaq, from Talha bin Musarrif, who said, I heard Abdul-Rahman bin Awsaja narrate it. Tirmidhi (1957) narrated it, saying, Abu Kurayb narrated to us, Ibrahim bin Yusuf bin Abu Ishaq narrated to us, from his father, from Abu Ishaq, except that he confined himself to the wording, "Whoever grants the loan of a milking animal, or lends silver, or guides someone along a road, will have a reward equal to freeing a slave." He said, "hasan sahih, gharib, from the hadith of Abu Ishaq, from Talha bin Musarrif. We do not know it except from this route, though Mansur bin Mutamir and Shuba both narrated this hadith from Talha bin Musarrif." End of quote.His saying, "zuqaqan," with the letter after the first consonant carrying a damma, means "road." What is meant by it is guiding someone lost, or blind, along their way. And his saying, "Beautify the Quran with your voices," it is said this means, "Beautify your voices with the Quran," this being an instance of inverted expression (maqlub), like the saying, "I presented the she-camel to the water trough," meaning, "I presented the water trough to the she-camel." Baghawi provided this explanation.