Second Book of Esdras (Author Nehemias or Esdras or both)
9:19tu autem in misericordiis tuis multis non dimisisti eos in deserto columna nubis non recessit ab eis per diem ut duceret eos in via et columna ignis in nocte ut ostenderet eis iter per quod ingrederentur
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.