Language

Some packages have to be included in the preamble to support it, as shown below.

\documentclass[a4paper,10pt]{article}
%In the preamble section include the arabtex and utf8 packages
\usepackage{arabtex}
\usepackage{utf8}

\begin{document}
%start encoding to unicode
%Note that your layout must support arabic text when compiling
\setcode{utf8}
%To start typing in Arabic use the command arabtext
hello
\begin{arabtext}
السَلامُ عَليكم ورَحمةُ الله وبَركاته
\end{arabtext}
arabic
\end{document}