Jami` at-Tirmidhi, Book 49, Hadith 4141 (In-Book) ⓘ
Narrated Anas bin Malik: That the Messenger of Allah was asked: "Which of the people of your house are most beloved to you?" He said: "Al-Hasan and Al-Husain." And he used to say to Fatimah: "Call my two sons for me." And he would smell them and hug them.
حَدَّثَنَا أَبُو سَعِيدٍ الأَشَجُّ، حَدَّثَنَا عُقْبَةُ بْنُ خَالِدٍ، حَدَّثَنِي يُوسُفُ بْنُ إِبْرَاهِيمَ، أَنَّهُ سَمِعَ أَنَسَ بْنَ مَالِكٍ، يَقُولُ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم أَىُّ أَهْلِ بَيْتِكَ أَحَبُّ إِلَيْكَ قَالَ " الْحَسَنُ وَالْحُسَيْنُ " . وَكَانَ يَقُولُ لِفَاطِمَةَ " ادْعِي لِي ابْنَىَّ " . فَيَشُمُّهُمَا وَيَضُمُّهُمَا إِلَيْهِ . قَالَ هَذَا حَدِيثٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ مِنْ حَدِيثِ أَنَسٍ
also referenced under: Hadith 3772 (Reference) & Volume 6, Book 46, Hadith 3772 (DarusSalam)