Is it ensure, insure, or assure?
1530s, quaere "a question," from Latin quaere "ask," imperative of quaerere "to seek, look for; strive, endeavor, strive to gain; ask, require, demand;" figuratively "seek mentally, seek to learn, make inquiry," probably ultimately from PIE *kwo-, root forming the stem of relative and interrogative pronouns (see who). Spelling Englished or altered c.1600 by influence of inquiry.
"to question," 1650s, from query (n.). Related: Queried; querying.