All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
The Naqshabandiyyah is a Sufi school ascribed to Bahaa’ Ad-Deen As-Sayyid Muhammad Al-Uwaysi Al-Bukhari, known as Shaah Naqshaband. He was born in Qasr ‘Aarfaan in Bukhaara.
The Naqshabandiyyah, like all other Sufi Tareeqahs (orders), have adopted some Bid‘ahs (religious innovations) in Thikr (mentioning the name of Allaah the Almighty). Also, some of their beliefs are against the creed of Ahlus-Sunnah Wal-Jamaa'ah (the mainstream people of the Sunnah), especially regarding faith and other issues of ‘Aqeedah (creed). The questioner should thus be warned against this group.
Allaah Knows best.