The Messenger of Allah ﷺ said, "There has crept upon you the disease of the nations before you, envy and hatred. Hatred is the shaver. I do not mean it shaves hair, but rather it shaves away religion. By the One in whose hand is the soul of Muhammad, you will not enter Paradise until you believe, and you will not believe until you love one another. Shall I not tell you of something which, if you do it, you will love one another? Spread the greeting of peace among yourselves."
حدثنا يزيد بن هارون أنبأنا هشام عن يحيى بن أبي كثير عن يعيش بن الوليد بن هشام وأبو معاوية شيبان عن يحيى بن أبي كثير عن يعيش بن الوليد بن هشام
قال رسول الله ﷺ دب إليكم داء الأمم قبلكم الحسد والبغضاء والبغضاء هي الحالقة حالقة الدين لا حالقة الشعر والذي نفس محمد بيده لا تؤمنوا حتى تحابوا أفلا أنبئكم بشيء إذا فعلتموه تحاببتم أفشوا السلام بينكم
Its chain is daif due to a break in transmission. Abu Muawiya Shayban bin Abdul-Rahman Tamimi is reliable, and the authors of the six books narrated from him. As for the one who says, "and Abu Muawiya Shayban," he means Yazid bin Harun, meaning that he narrated the hadith from Hisham and Shayban, both of whom narrated from Yahya. Yahya bin Abu Kathir was a minor successor who was reliable. Yaish bin Walid bin Hisham bin Muawiya bin Hisham bin Uqbah bin Abu Muayt was reliable, but he did not meet Zubayr. The hadith will come up three more times, at 1430-1432, all of them from Yaish from a freedman of the family of Zubayr, and this freedman is unknown.In Tahdheeb 12:391, it states that Tabarani named him Habban, but this only adds to the obscurity, since he did not mention his evidence for this. The hadith was narrated by Tirmidhi at 3:320, "You will not enter Paradise until you believe," and so on. The commentator on Tirmidhi quoted from Mulla Ali Qari, saying that this is how it appears in the current manuscripts, with the noon dropped, and perhaps the explanation is that the prohibition form is sometimes intended to convey negation, just as the reverse is well known among scholars. He quoted something similar from him in his commentary on the hadith of Abu Hurairah, "You will not enter Paradise until you believe," at 3:383. Something similar to this has already come up, namely, the occurrence of the indicative verb form in the shape of the jussive, at 1401. Many verbs have occurred in this manner, and the grammarians interpret them by taking "idha" to mean "mata," and taking "law" to mean "in," as in the examples given in Shawahid Tawdih by Ibn Malik, 11-12. But I consider this to be forced.The hadith itself is sahih, coming through Abu Hurairah, as we indicated with Tirmidhi's version, and Muslim also narrated it at 1:31 through Abu Hurairah. It will come up again in the Musnad several times, at 9073, 9074, 9707, 10180, 10435, and 10658.