This particular argument could be said against most of things Christians who are pursuing Torah are doing. The ironic thing about it though, is that they are saying it isn't commanded anywhere, but there are numerous examples of those same "OT Laws" being kept in the NT. There is also a list of 1,050 "commands" in the NT floating around on social media, but when looking over that list, most are either taken out of context or not really a command. The ones that are commands can be traced back to, you guessed it, the Law/Torah.
The idea I bring up in the comic is one that doesn't make any sense when you think about it. Jesus refers to God as our Father multiple times, showing the type of relationship we have with Him. A good father doesn't have one set of rules that he then changes later on to be almost opposite of what he originally gave. He wouldn't say something is forever, and then later down the road be like "okay, we don't need to do this anymore". He wouldn't have one set of rules for one child and a totally different set for another child. Yet, in the modern mainstream Christian thought, these things a good father wouldn't do, is exactly what our Heavenly Father is doing.
A final note on a command being mentioned in order to be valid: What are your thoughts on someone marrying their sister? That's not prohibited anywhere in the NT. You might say "that's the moral law, and we still keep that". The Bible, even in the NT, makes no such distinction of a moral law vs other laws. A common verse brought up about the Law, James 2:10, says if you keep the whole law but stumble on one you break all of it. The verse above it gives examples of those laws: murder and adultery. Every Christian I have ever known would say both of these things are a sin. Yet, James never makes a distinction saying these are only part of the Law or the "moral" law. The readers at the time would know he is referring to the Torah. All of it. So, if marrying your sister is still not something you should be doing because God said not to, then according to James, the other aspects of the Law, like keeping the Sabbath, should be kept as well, unless you want to break the whole thing.
https://thestraightandnarrow.cfw.me/comics/547
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