save.tex

\documentclass{article}
\usepackage{xparse,expl3,environ}

\ExplSyntaxOn
\NewEnviron{save}[1]{
  \tl_new:c  { saved_text__#1 }
  \tl_set:cv { saved_text__#1 } {
    \BODY
  }
}
\NewDocumentCommand \UseSaved { m } {
  \use:c { saved_text__#1 }
}
\ExplSyntaxOff

\begin{document}
\begin{save}{some text}
  I have some text.
  This is a quotation.
  
  I'm bad at coming up with examples.
\end{save}

\UseSaved{some text}
\UseSaved{some text}
\UseSaved{some text}
\end{document}