\documentclass{article}

\usepackage{tikz}
\usepackage{bidi-atbegshi}
\usepackage{ptext}
\usepackage{xepersian}
\settextfont{Yas}

\AtBeginShipoutInit
\newcommand{\border}{%
  \begin{bidi@tikzpicture}[remember picture,overlay]%
    \fill [yellow!40!blue] {(current page.south east) rectangle (current page.north west)};%
  \end{bidi@tikzpicture}%
}
\AtBeginShipout{\AtBeginShipoutAddToBox{\border}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\ptext
\end{document}