Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 184

وَعَن يعلى بن مرَّة قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «حُسَيْنٌ مِنِّي وَأَنَا مِنْ حُسَيْنٍ أَحَبَّ اللَّهُ مَنْ أَحَبَّ حُسَيْنًا حُسَيْنٌ سِبَطٌ مِنَ الأسباط» رَوَاهُ التِّرْمِذِيّ

Ya’la b. Murra reported God’s messenger as saying, “Husain pertains to me and I to him. May God love him who loves Husain! Husain is a grandson[*].” *Another possibility is `a tribe’, meaning that he would have many descendants; but the translation above is more likely. Cf. Mirqat , 5:605. Tirmidhi transmitted it.