The Prophet ﷺ said that Allah said, "There are three whom I will oppose on the Day of Resurrection: a man who gave his word in My name and then betrayed it, a man who sold a free person and consumed the price, and a man who hired a worker, took full service from him, but did not pay him his wages."
عن النبي ﷺ قال: قال الله: ثلاثة أنا خصمهم يوم القيامة: رجل أعطى بي ثم غدر، ورجل باع حرا فأكل ثمنه، ورجل استأجر أجيرا فاستوفى منه ولم يعط أجره.
Bukhari narrated it in the Book of Sales (2227) from Bishr bin Marhoom, who said, "Yahya bin Salim told us, from Ismail bin Umaya, from Saeed bin Abu Saeed, from Abu Hurairah," and he related it.Some narrators added, after his saying "I will be their opponent on the Day of Resurrection," the words "and whoever I am his opponent, I will defeat him." Bayhaqi mentioned this (14/6) and attributed it to Bukhari, but this is not sound, for Bukhari did not mention this addition. Rather, it was Ibn Jarud who mentioned it in Muntaqa (579), after narrating it from Mahmud bin Adam, who said, "Yahya bin Salim told us with his chain."Some scholars have discussed this hadith, because it turns on Yahya bin Salim, the Qurashi, the Taifi. Scholars have differed over affirming his reliability or criticizing him. Ibn Main, Ibn Saad, and Ajli affirmed his reliability.Nasai said, "There is no harm in him, but his hadith is objectionable when narrating from Ubaydullah bin Umar."Saji said, "He is truthful but makes mistakes in hadith, and he erred in some hadiths he narrated from Ubaydullah bin Umar al-Umari."There is other discussion about him besides this, and the gist of it is that he makes mistakes in hadiths he narrates from Ubaydullah bin Umar al-Umari. Bukhari, for his part, avoided his narrations from Ubaydullah bin Umar, indeed there is nothing else from him in his Sahih besides this one hadith.Moreover, the man had a written book. Yaqub bin Sufyan said, "He was a righteous man, and his book was sound. When he narrated from his book, his hadith was hasan, but when he narrated from memory, some of it would be recognized as correct and some would be rejected."So it is not unlikely that he narrated this hadith from that book, and Bishr bin Marhoom heard it from him in that way. For Nufayli narrated from him and added in the chain, after his saying "Saeed," the words "from his father."The group narrated it, including Bishr bin Marhoom, Ibn Tabbaa, Nuaym, Ibrahim bin Hamza, and Mahmud bin Ibrahim, all of them from Yahya bin Salim, and they did not mention in it "from his father." Ibn Jarud mentioned this.The narration of the group is preferable, and it is what Bukhari relied upon. It is therefore not right to be bold in opening the door to weakening the hadiths of the Sahih merely because scholars differ over one of the narrators of a hadith, so long as he is not accused of fabrication, and it is highly unlikely that you would find an accused narrator in the Sahih. As for differences among scholars, few narrators have been spared from that.