Under the Bharatiya Nagarik Suraksha Sanhita, 2023 (BNSS), power of arrest by Magistrate is provided in…

Section 41 BNSS (formerly section 44 CrPC) gives a Magistrate powers of arrest, including arresting or ordering the arrest of an offender who commits an offence in the Magistrate's presence within local jurisdiction. It also permits arrest in the Magistrate's presence of a person for whom the Magistrate could then issue an arrest warrant.

Why not "35 BNSS."? Section 35 BNSS governs when a police officer may arrest without a warrant, not a Magistrate's power of arrest.