It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that indeed the Prophet (peace and blessings be upon him) said: "When any one of you loves his brother, he should inform him."
Hadith Referenceمسند الشهاب / 765
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، وأخرجه المعجم الكبير : 13361، شعب الايمان : 8594»