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From: Scott Pakin <scott+ctt@pakin.org>
Newsgroups: comp.text.tex
Subject: Re: (LaTeX) This doesn't work -- \mbox{ First Line \\ Second Line}
Date: Mon, 19 Aug 2024 10:17:19 -0600
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Another package worth considering, depending on your needs, is 
needspace.  needspace provides commands that insert a page break if less 
than a given amount of vertical space remains on the page:

     \needspace{2\baselineskip}
     First Line \\
     Second Line

-- Scott