Print text messages for court

Take screenshots of it, then print those screenshots.

Take a screenshot

https://support.apple.com/en-ie/guide/iphone/iphc872c0115/ios

Use AirPrint to print from your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT201387

Message > Open the conversation that you want to print.

Tap and hold the message and then select Copy (it will go to the Clipboard). You can also select multiple messages.

Now open the Pages app, paste the message and print it

or alternatively paste it to an email to yourself and print it from your computer.