Bihar's famous saint Sharfuddin Maneri is related to which Sufi sect he belonged to?

Explanation

Sharfuddin Ahmad was born in 1263 AD at Maner Sharif (Patna), and he died in 1381 AD at Bihar Sharif. Sharfuddin Maneri was a Sufi saint of the Firdausia silsila. He wrote a commentary on the Arabic work Adab-ul-Muridin by Suhrawardi. His famous work is Maktubat-e-Sadi.