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We present a Spitzer/IRAC survey of H-faint ($H_{160} \gtrsim 26.4$,$<5\sigma$) sources in 101 lensing cluster fields. Across a CANDELS/Wide-likesurvey area of $\sim$648 arcmin$^2$ (effectively $\sim$221 arcmin$^2$ in thesource plane), we have securely discovered 53 sources in the IRAC Channel-2band (CH2, 4.5 $\mathrm{\mu m}$; median CH2$=22.46\pm0.11$ AB mag) that lackrobust HST/WFC3-IR F160W counterparts. The most remarkable source in oursample, namely ES-009 in the field of Abell 2813, is the brightest H-faintgalaxy at 4.5 $\mathrm{\mu m}$ known so far ($\mathrm{CH2}=20.48\pm0.03$ ABmag). We show that the H-faint sources in our sample are massive (median$M_\mathrm{star} = 10^{10.3\pm 0.3}$ $M_\odot$), star-forming (median starformation rate $=100_{-40}^{+60}$ $M_\odot$yr$^{-1}$) and dust-obscured($A_V=2.6\pm0.3$) galaxies around a median photometric redshift of$z=3.9\pm0.4$. The stellar continua of 14 H-faint galaxies can be resolved inthe CH2 band, suggesting a median circularized effective radius($R_\mathrm{e,circ}$; lensing corrected) of $1.9\pm0.2$ kpc and $<1.5$ kpc forthe resolved and whole samples, respectively. This is consistent with the sizesof massive unobscured galaxies at $z\sim4$, indicating that H-faint galaxiesrepresent the dusty tail of the distribution of a wider galaxy population.Comparing with the ALMA dust continuum sizes of similar galaxies reportedpreviously, we conclude that the heavy dust obscuration in H-faint galaxies isrelated to the compactness of both stellar and dust continua($R_\mathrm{e,circ}\sim 1$ kpc). These H-faint galaxies make up$16_{-7}^{+13}$% of the galaxies in the stellar mass range of$10^{10}-10^{11.2}$ $M_\odot$ at $z=3\sim5$, contributing to $8_{-4}^{+8}$% ofthe cosmic star formation rate density in this epoch and likely tracing theearly phase of massive galaxy formation.

Extensive Lensing Survey of Optical and Near-Infrared Dark Objects (El Sonido): HST H-Faint Galaxies behind 101 Lensing Clusters