Excellence and Etiquette of Sincere love for the sake of Allah Riyad as-Salihin 383
Arabic hadith text
عن أبي كريمة المقداد بن معد يكرب رضي الله عنه عن النبي صلى الله عليه وسلم قال: "إذا أحب الرجل أخاه، فليخبره أنه يحبه" ((رواه أبو داود، والترمذي وقال : حديث حسن)).
Translation
Abu Karimah Al-Miqdam bin Ma'dikarib (May Allah be pleased with him) reported
The Prophet (ﷺ) said, "When a man loves his brother (for Allah's sake) let him tell him that he loves him".[Abu Dawud and At- Tirmidhi, who classified it as Hadith Sahih].