Hadithcore
Riyad as-Salihin, 383

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". <b>[Abu Dawud and At- Tirmidhi, who classified it as Hadith Sahih]</b>.

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)‏‏)‏‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 383
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) When one loves his brother, he should tell him as this is part of the guidance of the Prophet (may Allah’s peace and blessings be upon him).<br> 2) To inform whom you love that you love him for the sake of Allah is a reason for fortifying the bond of brotherhood and fostering friendliness and affection.