Hadith on Tawhid: Some Jews and Christians take their leaders as gods

‘Adi ibn Hatim reported: I came to the Prophet, peace and blessings be upon him, while I had a crucifix of gold around my neck. The Prophet said, “O ‘Adi! Remove this idol from yourself!” I heard him reciting the verse in Surat al-Tawbah, “They have taken their priests and rabbis as lords besides Allah.” (9:31) The Prophet said, “As for them, they did not worship them, but rather when they made something lawful for them, they considered it lawful. When they made something unlawful for them, they considered it unlawful.

Source: Sunan al-Tirmidhī 3095

Grade: Hasan li ghayrihi (fair due to external evidence) according to Al-Albani

عَنْ عَدِيِّ بْنِ حَاتِمٍ قَالَ أَتَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَفِي عُنُقِي صَلِيبٌ مِنْ ذَهَبٍ فَقَالَ يَا عَدِيُّ اطْرَحْ عَنْكَ هَذَا الْوَثَنَ وَسَمِعْتُهُ يَقْرَأُ فِي سُورَةِ بَرَاءَةٌ اتَّخَذُوا أَحْبَارَهُمْ وَرُهْبَانَهُمْ أَرْبَابًا مِنْ دُونِ اللَّهِ قَالَ أَمَا إِنَّهُمْ لَمْ يَكُونُوا يَعْبُدُونَهُمْ وَلَكِنَّهُمْ كَانُوا إِذَا أَحَلُّوا لَهُمْ شَيْئًا اسْتَحَلُّوهُ وَإِذَا حَرَّمُوا عَلَيْهِمْ شَيْئًا حَرَّمُوهُ

3095 سنن الترمذي كتاب تفسير القرآن باب ومن سورة التوبة

3293 المحدث الألباني خلاصة حكم المحدث حسن بجموع الطرق في السلسلة الصحيحة