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[abbreviated] We present a census of Ly\alpha\ emission at $z\gtrsim7$utilizing deep near infrared HST grism spectroscopy from the first sixcompleted clusters of the Grism Lens-Amplified Survey from Space (GLASS). In24/159 photometrically selected galaxies we detect emission lines consistentwith Ly\alpha\ in the GLASS spectra. Based on the distribution ofsignal-to-noise ratios and on simulations we expect the completeness and thepurity of the sample to be 40-100% and 60-90%, respectively. For the objectswithout detected emission lines we show that the observed (not corrected forlensing magnification) 1$\sigma$ flux limits reaches$5\times10^{-18}$erg/s/cm$^{2}$ per position angle over the full wavelengthrange of GLASS (0.8-1.7$\mu$m). Based on the conditional probability ofLy\alpha\ emission measured from the ground at $z\sim7$ we would have expected12-18 Ly\alpha\ emitters. This is consistent with the number of detections,within the uncertainties, confirming the drop in Ly\alpha\ emission withrespect to $z\sim6$. These candidates include a promising source at $z=8.1$.The spatial extent of Ly\alpha\ in a deep stack of the most convincingLy\alpha\ emitters with $\langle z\rangle=7.2$ is consistent with that of therest-frame UV continuum. Extended Ly$\alpha$ emission, if present, has asurface brightness below our detection limit, consistent with the properties oflower redshift comparison samples. From the stack we estimate upper limits onrest-frame UV emission line ratios and find $f_\textrm{CIV} /f_\textrm{Ly${\alpha}$} \lesssim 0.32$ and $f_\textrm{CIII]} /f_\textrm{Ly$\alpha$} \lesssim 0.23$ in good agreement with other valuespublished in the literature.

The Grism Lens-Amplified Survey from Space (GLASS). III. A census of Ly\alpha\ Emission at $z\gtrsim$7 from HST Spectroscopy