\documentclass{book}
\usepackage{array}
\usepackage{xepersian}
\usepackage{bidiftnxtra}
\settextfont{XB Zar}
\begin{document}


\begin{tabular}{|>{\centering\arraybackslash}p{3cm}|}
\hline
first row \\
\hline
\end{tabular}

\end{document}