They give a DALEEL which relates from Hadhrat Ibn Masood Rdh saw a group of people (jamaat) waiting for fajr salaah and were sitting in Halqas (groups). They had small stones in hands and were doing Dhikr. Hadhrat Ibn Masood Rdh declared that this act is a bidah. (Sunan e Darmi: Hadith No. 210, Darul Mughni KSA Edition)
The chain of this hadith is like this
أَخْبَرَنَا الْحَكَمُ بْنُ الْمُبَارَكِ، أَنبَأَنَا عَمْرُو بْنُ يَحْيَى، قَالَ: سَمِعْتُ أَبِي، يُحَدِّثُ، عَنْ أَبِيهِ قَالَ: كُنَّا نَجْلِسُ عَلَى بَابِ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ رَضِيَ اللَّهُ عَنْهُ
(Sunan E Darmi: Page 286, Hadith No 210)
The Scholars have classed him as Daeef and Ibn Abi Yahiya RH has even called him a Kazzab.
Lets look at what the Scholars have said:
1. Imam Ibn Maeen Rh says "He is nothing and i have seen his hadiths"
(Al Kaamil Li Ibn A’adi : Volume 6 : Page 215)