Umm Darda reported: Abu Darda, may Allah be pleased with him, entered upon me while he was furious. I said, “Why are you angry?” Abu Darda said, “By Allah, I do not recognize any of the affairs of Muhammad among them except that they pray in congregation.”
Source: al-Bida’ li-Ibn Waḍḍāḥ 1/130
عَنْ أُمِّ الدَّرْدَاءِ قَالَتْ دَخَلَ عَلَيَّ أَبُو الدَّرْدَاءِ رضي الله عنه وَهُوَ غَضْبَانُ فَقُلْتُ لَهُ مَا أَغْضَبَكَ فَقَالَ وَاللَّهِ مَا أَعْرِفُ فِيهِمْ مِنْ أَمْرِ مُحَمَّدٍ شَيْئًا إِلَّا أَنَّهُمْ يُصَلُّونَ جَمِيعًا
1/130 البدع لابن وضاح