\documentclass{article}
\usepackage{array}
\usepackage{xepersian}
\settextfont{Yas}
\newcolumntype{I}{!{\vrule width 3pt}}
\newlength\savedwidth
\newcommand\whline{\noalign{\global\savedwidth\arrayrulewidth
                            \global\arrayrulewidth 3pt}%
                   \hline
                   \noalign{\global\arrayrulewidth\savedwidth}}
\begin{document}
\begin{tabular}{|cIc|c|} \hline
 الف  & ب  & پ  \\ \hline
 ت  & ح  & ث \\ \whline
100 & 10 & 1  \\ \hline \end{tabular}
\end{document}