حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا الْمُبَارَكُ بْنُ فَضَالَةَ، حَدَّثَنَا ثَابِتٌ الْبُنَانِيُّ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَجُلاً، كَانَ عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَمَرَّ بِهِ رَجُلٌ فَقَالَ يَا رَسُولَ اللَّهِ إِنِّي لأُحِبُّ هَذَا . فَقَالَ لَهُ النَّبِيُّ صلى الله عليه وسلم " أَعْلَمْتَهُ " . قَالَ لاَ قَالَ " أَعْلِمْهُ " . قَالَ فَلَحِقَهُ فَقَالَ إِنِّي أُحِبُّكَ فِي اللَّهِ . فَقَالَ أَحَبَّكَ الَّذِي أَحْبَبْتَنِي لَهُ .
Narrated Anas ibn Malik: A man was with the Prophet (PBUH) and a man passed by him and said: Messenger of Allah! I love this man. The Messenger of Allah (PBUH) then asked: Have you informed him? He replied: No. He said: Inform him. He then went to him and said: I love you for Allah's sake. He replied: May He for Whose sake you love me love you! Translation Not Available
Book Ref: Sunan Abi Dawud Book 43 Hadith 5125
Web Ref: Sunan Abi Dawud Book 42 Hadith 5106