https://ui.adsabs.harvard.edu/abs/2022arXiv221211638NNanayakkara et al. 2023They report the finding of 5 new quiescent galaxies at z ≈ 3 − 4 with spectra obtained by JWSTThey used NIRSpec (with the MSA configuration)
Breadcrumbs
A population of faint, old, and massive quiescent galaxies at 3 < z < 4 revealed by JWST NIRSpec Spectroscopy
https://ui.adsabs.harvard.edu/abs/2022arXiv221211638N
Nanayakkara et al. 2023