The Collaborative International Dictionary of English v.0.48:
Exhort \Ex*hort"\, v. t. [imp. & p. p. Exhorted; p. pr. & vb.
n. Exhorting.] [L. exhortari; ex out + hortari to incite,
encourage; cf. F. exhorter. See Hortative.]
To incite by words or advice; to animate or urge by
arguments, as to a good deed or laudable conduct; to address
exhortation to; to urge strongly; hence, to advise, warn, or
Examples gross as earth exhort me. --Shak.
Let me exhort you to take care of yourself. --J. D.