It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him), he said: When you love your brother, never quarrel with him, nor treat him badly, nor ask anyone about him. It may happen that you meet one of his enemies, and he tells you something about him which is not true, and thus he creates separation between you.
Hadith Referenceالادب المفرد / كتاب / 545
Hadith Gradingالألبانی:صحيح الإسناد موقوفًا و روى عنه مرفوعًا
Hadith Takhrij«صحيح الإسناد موقوفًا و روى عنه مرفوعًا : أخرجه أبوداؤد فى الزهد : 187 و ابن السني فى عمل اليوم و الليلة : 200 - الضعيفة : 1420»
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Prophet (peace and blessings of Allah be upon him) said: "Whoever loves any of his religious brothers for the sake of Allah and says, 'I love you for the sake of Allah,' then both of them will enter Paradise together. The person who loved solely for the sake of Allah will have a higher rank than the one who loved him because of that love."
Hadith Referenceالادب المفرد / كتاب / 546
Hadith Gradingالألبانی:ضعيف
Hadith Takhrij«ضعيف : أخرجه ابن وهب فى الجامع : 205 و عبد بن حميد : 332 و الطبراني فى الكبير : 28/13»