Salman Farsi reported,
Salman said, "I was one of the sons of the Persian cavalry knights." He then narrated the story, saying, "I set off, the land lifting me up at times and lowering me at others, until I passed by some Bedouins who took me as a slave and sold me. Eventually a woman bought me. I heard them mentioning the Prophet ﷺ, and food was scarce in those days.I said to her, 'Grant me a day off.'She said, 'Yes.'So I went out, gathered firewood, sold it, prepared some food, and brought it to the Prophet ﷺ. I placed it before him, and he asked, 'What is this?'I said, 'Charity.'He said to his companions, 'Eat,' but he himself did not eat. I said to myself, 'This is one of his signs.'Then I waited as long as Allah willed me to wait, and I said to my mistress, 'Grant me a day off.'She said, 'Yes.'So I went out and gathered more firewood than before, prepared some food, and brought it to him while he was sitting among his companions. I placed it before him, and he asked, 'What is this?'I said, 'A gift.'He extended his hand and said to his companions, 'Take, in the name of Allah.' I stood behind him, and he laid aside his cloak, revealing the seal of prophethood.I said, 'I bear witness that you are the Messenger of Allah.'He said, 'How is that?'So I told him about the man and said, 'Will he enter Paradise, Messenger of Allah? For he told me that you are a prophet.'He said, 'None shall enter Paradise except a Muslim soul.'I said, 'Messenger of Allah, he informed me that you are a prophet. Will he enter Paradise?'He said, 'None shall enter Paradise except a Muslim soul.'"
Azami 4274
Hasanعن سلمان الفارسي، قال
كنت من أبناء أساورة فارس- فذكر الحديث- قال: فانطلقت ترفعني أرض وتخفضني أخرى حتى مررت على قوم من الأعراب فاستعبدوني فباعوني حتى اشترتني امرأة فسمعتهم يذكرون النبي ﷺ وكان العيش عزيزا فقلت لها: هبي لي يوما فقالت: نعم، فانطلقت فاحتطبت حطبا فبعته فصنعت طعاما فأتيت به النبي ﷺ فوضعته بين يديه فقال: ما هذا؟ فقلت: صدقة. فقال الأصحابه: كلوا. ولم يأكل قلت: هذه من علاماته، ثم مكلت ما شاء الله أن أمكث فقلت: لمولاتي هبي لي يوما. قالت: نعم، فانطلقت فاحتطبت حطبا بأكثر من ذلك فصنعت طعاما فأتيته به، وهو جالس بين أصحابه فوضعته بين يديه فقال: ما هذا؟ قلت: هدية فوضع يده وقال لأصحابه: خذوا بسم الله. وقمت خلفه فوضع رداءه فإذا خاتم النبوة، فقلت: أشهد أنك رسول الله. فقال: وما ذاك؟ فحدثته عن الرجل وقلت: أيدخل الجنة يا رسول الله فإنه حدثني أنك نبي؟ فقال: لن يدخل الجنة إلا نفس مسلمة. فقلت: يا رسول الله إنه أخبرني أنك نبي أيدخل الجنة؟ قال: لن يدخل الجنة إلا نفس مسلمة.
Imam Ahmad (23712) and Tabarani in al-Kabir (6/259) both narrated it from the hadith of Israil, who said, "Abu Ishaq narrated to us, from Abu Qurra Kindi, from Salman Farsi," and he related it. Ibn Hibban graded it sahih (7124).I say, its chain is hasan, for Abu Qurra Kindi, whose name is not known, was deemed reliable by Ibn Hibban, who listed him among the trustworthy of the Followers. He was also known to Ibn Saad, who said in his Tabaqat (6/148), "He was a judge in Kufa, and his name was so-and-so bin Salama. He narrated from Umar bin Khattab, Salman, and Huzaifa bin Yaman, and he was known, though he narrated few hadiths." He was also mentioned by the biographers and historians, and Hakim narrated it (4/108) through his path in abridged form, saying, "Its chain is sahih."Moreover, he was not alone in relating this story, whether in abridged or lengthy form. Abu Tufayl corroborated him, as found in Ahmad (23704) and Tabarani in al-Kabir (6071), though in the chain leading to him is Sharik, that is, Sharik bin Abdullah Nakhai, who was weak in memory. Abu Uthman Nahdi also corroborated him, as found in Tabarani (6121), as did Burayda Aslami, also in Tabarani (6070), all of them narrating from Salman.This story was also narrated through other hasan paths. Among them is what Ahmad narrated (23737), Bazzar in his Musnad (2499, 2500), Tabarani in al-Kabir (6065), and Ibn Saad in al-Tabaqat (4/75-80), all of them through paths from Muhammad bin Ishaq, who said, "Asim bin Umar bin Qatada Ansari narrated to me, from Mahmud bin Labeed, from Abdullah bin Abbas, who said, Salman Farsi related his story to me from his own mouth," and he told it (relating the story at greater length than here). Ibn Ishaq was a mudallis, but he explicitly stated that he received it directly.As for what was narrated from Abdul-Rahman bin Alqama Thaqafi, who said, "A delegation of Thaqif came to the Messenger of Allah ﷺ bringing a gift with them, and he said, 'Is this a gift or a charity? If it is a gift, then thereby one seeks the face of the Messenger of Allah ﷺ and the fulfillment of a need, but if it is charity, then thereby one seeks the face of Allah 
.'" They said, "No, rather it is a gift." So he accepted it from them, and sat with them asking them questions and being asked questions by them until he prayed Dhuhr together with Asr. In it is an unknown man.Nasai narrated it (3758) from Hannad bin Sari, who said, "Abu Bakr bin Ayyash narrated to us, from Yahya bin Abu Hani, from Abu Huzaifa, from Abdullah bin Maen bin Bashir, from Abdul-Rahman bin Alqama," and he related it. Abu Huzaifa, unattributed, is a teacher of Yahya bin Hani, and he is "unknown."Through this same path it was also narrated by Ibn Abu Shayba (5/230), Bukhari in Tarikh al-Kabir (5/251), and Aqeeli in Duafa (3/33) under the biography of Abdul-Malik bin Muhammad bin Bashir, who said, "He is not corroborated in this, and he is known only through him."