Is it ensure, insure, or assure?
Old English inn "lodging, dwelling, house," probably from inne (adv.) "inside, within" (see in). Meaning "public house with lodging" is perhaps by c.1200, certainly by c.1400. Meaning "lodging house or residence for students" is early 13c. in Anglo-Latin, obsolete except in names of buildings that were so used (e.g. Inns of Court, mid-15c.).
in the modern sense, unknown in the East. The khans or caravanserais, which correspond to the European inn, are not alluded to in the Old Testament. The "inn" mentioned in Ex. 4:24 was just the halting-place of the caravan. In later times khans were erected for the accommodation of travellers. In Luke 2:7 the word there so rendered denotes a place for loosing the beasts of their burdens. It is rendered "guest-chamber" in Mark 14:14 and Luke 22:11. In Luke 10:34 the word so rendered is different. That inn had an "inn-keeper," who attended to the wants of travellers.
building that affords public lodging, and sometimes meals and entertainment, to travelers. The inn has been largely superseded by hotels and motels, though the term is often still used to suggest traditional hospitality.