Anyone who loves Al-Hasan and Al-Husayn has indeed loved me, and anyone who hates them has indeed hated me
Authentic hadithعن أبي هريرة رضي الله عنه قال: قال النبي صلى الله عليه وسلم : «مَن أحبَّ الحسن والحُسين فقد أحبَّني، ومَن أبغضهما فقد أبغضني».
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Anyone who loves Al-Hasan and Al-Husayn has indeed loved me, and anyone who hates them has indeed hated me.”
Explanation
This Hadīth indicates the high status of Al-Hasan and Al-Husayn, the Prophet's grandsons. Anyone who loves them has indeed loved the Prophet (may Allah's peace and blessings be upon him) and anyone who hates them has actually hated the Prophet.
Source · Narrated by Ibn Majah - Narrated by Ahmad
From the Hadith Encyclopedia (hadeethenc.com).