LaTeX: Mixing Japanese, English and Devanagari something in a LaTeX document

test-devanagari.tex

% XeLaTeX or LuaLaTeX document; UTF-8
\documentclass[autodetect-engine,a4paper,ja=standard]{bxjsarticle}
\usepackage{fontspec}
\setmainfont{TeX Gyre Pagella}
\newfontfamily{\fChandas}[Script=Devanagari]{Chandas}
\newcommand*{\xSentence}[3]{\par\noindent
  #1\\#2\\{\fChandas#3}\par\medskip}
\setlength{\parindent}{0pt}
\begin{document}

\xSentence{{\TeX}言語危険、近づくな。}
  {{\TeX}abhāṣā saṃkaṭā nopagaccha.}
  {तेखभाषासंकटानोपगच्छ।}
\xSentence{{\TeX}言語、ダメゼッタイ。}
  {{\TeX}abhāṣaikāntavidhvaṃsinī.}
  {तेखभाषैकान्तविध्वंसिनी।}

\end{document}