Robots.txt Nofollow to third party website

Hello,

Can I stop the robots to follow a third party website which is present
in multiple pages of my website or where ever it appears in my website
using robots.txt file?

Typically the code I want to add in my robots.txt file looks like:

User-agent: *
disallow: example.com/index.php

Please send me suggestions.

Thanks
ALTS

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