(185) بَابُ لا تَعِدْ أَخَاكَ شَيْئًا فَتُخْلِفَهُ
Ibn 'Abbas reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Do not dispute with your brother. Do not make fun of him. Do not make a promise to him and then break it."
Reference: Al-Adab Al-Mufrad 394
In-book reference: Book 21, Hadith 10
English translation: Book 21, Hadith 394