It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Shirk is more hidden than the sound of an ant creeping over a (black) rock on a dark night. Its lowest degree is that you love something of injustice or hate something of justice. And is the religion anything other than love and hatred for the sake of Allah? Allah, the Mighty and Majestic, has said: 'Say: If you love Allah, then follow me; Allah will love you' [Surah Al Imran: 31] ." This hadith has a sahih (authentic) chain of narration, and the two Shaykhs (Bukhari and Muslim) did not record it.