God from the spirits of others. The presence of the definite article or its equivalence, often appearing in a construct state, is a rule of thumb for judging the spirit of God. The main objective of this study is to investigate the evolution of the various רוח references in a given literary tradition. Hence, various issues inherent to the book of Isaiah will not receive the attention that they deserve. For instance, intertextuality between the various strata of the book is outside the scope of this