The Messenger of Allah ﷺ said, "A servant's faith will not be upright until his heart is upright, and his heart will not be upright until his tongue is upright. No man whose neighbor is not safe from his harm will enter Paradise."
قال رسول الله ﷺ: لا يستقيم إيمان عبد حتى يستقيم قلبه، ولا يستقيم قلبه حتى يستقيم لسانه، ولا يدخل رجل الجنة لا يأمن جاره بوائقه.
Ahmad (13048) narrated it from Zayd bin Hubab, who said, Ali bin Masada Bahili informed me, saying, Qatada narrated to us, from Anas bin Malik, and he related it.Its chain of transmission is hasan, due to the discussion concerning Ali bin Masada Bahili, Abu Habib Basri. Abu Dawud declared him daif, and Bukhari said, "There is something questionable about him," and Nasai said, "He is not strong."However, Abu Hatim said, "There is no harm in him," and Ibn Main said, "He is sound," and in another report, "There is no harm in him with regard to the Basrans."I say, his teacher Qatada is one of the Basrans, so his hadith is to be graded hasan, especially when it has a basis, and this hadith has one.