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In the past few years, there has been a rise in the detection of streamers, asymmetric flows of material directed toward the protostellar disk with material from outside the star's natal core. It is unclear how they affect the process of mass accretion, in particular beyond the Class 0 phase. Aims. We investigate the gas kinematics around Per-emb-50, a Class I source in the crowded star-forming region NGC 1333. Our goal is to study how the mass infall proceeds from envelope to disk scales in this source. Results. We discover a streamer delivering material toward Per-emb-50 in H$_2$CO ","authors_text":"3), 4), A. Dutrey (6), A. Fuente (7), A. L\\'opez-Sepulcre (3, B. Zhao (9), D. M. Segura-Cox (2), D. Semenov (5), E. Chapillon (6, G. V. Smirnov-Pinchukov (5), I. Jim\\'enez-Serra (8), J. E. Pineda (1), L. Bouscasse (3), M. J. Maureira (1), M. Tafalla (7), M. T. Valdivia-Mena (1), N. Cunningham (4), P. Caselli (1), R. Neri (3), S. Guilloteau (6), S. Marino (5), Th. Henning (5), T. H. 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