Friedrich Kluge, An Etymological Dictionary of the German Language (1891)
“ AS. rœst, E. rest, OSax. rasta, ręsta, ‘couch, deathbed,’ Du. rust (see Rüste) , ‘rest, repose.’ The common Teut. word is based on a root ras, ‘to remain, dwell,’ which may also be inferred from Goth. razn and OIc. rann, ‘house.’ Rast, in the sense of ‘stage,’ comes from the period when the Western Aryans were migrating to Europe; only a wandering tribe could adopt the intervals of reposing and encamping as a measure of distances. ”
