I’ve been seeing many people on my friends list talking…

I’ve been seeing many people on my friends list talking about dietary laws and the importance of keeping the Sabbath. I’m under the impression that the dietary laws were specific to the Israelites for a specific time for a specific purpose and that God has declared all foods clean.

Can anyone help me with scripture that will help solidify my view?

Even better, help me understand why people think that the dietary laws are still in place for EVERYONE, not just the Israelites.