\documentclass[12pt]{article}

\usepackage{longtable}
\usepackage{fontspec}
\usepackage{polyglossia}

\setmainlanguage{english}
\setotherlanguages{syriac}

\setromanfont [Mapping = {tex-text}, Numbers={OldStyle}]{Linux Libertine}

\newfontfamily\syriacfont[Script=Syriac, Scale=1.3]{Serto Batnan}

\begin{document}

\title{Test for Right Justified Paragraph}
\maketitle

\begin{longtable}{p{7cm} p{7cm}}

No. 1 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras dolor nunc, semper eu porta quis, tempor ut nisl. Etiam volutpat nibh sit amet ligula pharetra ullamcorper. Aenean sed risus augue, at auctor nibh. & \textsyriac{
ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ
}\\

No. 2 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras dolor nunc, semper eu porta quis, tempor ut nisl. Etiam volutpat nibh sit amet ligula pharetra ullamcorper. Aenean sed risus augue, at auctor nibh. & \textsyriac{
ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ
}\\

No. 3 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras dolor nunc, semper eu porta quis, tempor ut nisl. Etiam volutpat nibh sit amet ligula pharetra ullamcorper. Aenean sed risus augue, at auctor nibh. & \textsyriac{
ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ
}\\

No. 4 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras dolor nunc, semper eu porta quis, tempor ut nisl. Etiam volutpat nibh sit amet ligula pharetra ullamcorper. Aenean sed risus augue, at auctor nibh. & \textsyriac{
ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ ܗܢܐ ܟܬܝܒܬܐ ܣܘܪܝܝܬܐ ܘܐܦ ܝܬܝܪ
}
\end{longtable}

\end{document}