How do I explain to an SDA friend about Sunday Worship?

Hello…

I’m in discussions with a Seventh Day Adventist friend about the Sabbath and he brings up Hebrews 4:3-11 and says that it proves that we are to worship on the Sabbath (Saturday) instead of Sunday.

He also mentions that in Matthew 24:20-21, Jesus says about the end of time to pray that it doesn’t happen on the Sabbath. Since Jesus was talking about future events, why would he mention the Sabbath if we are not meant to keep it?

How do I respond to these?

Thanks.
OMGJ

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