Deen Was Always Islam- Sabbath
In following video Ghamidi sb talked about why some there were changes in some aspects of shariyah. Although he didnt talk about sabbath but still worth watching. Kindly refer video 0:53:56 to 1:04:46 https://youtu.be/rdPgpS5YNUk?t=3257
When deen was made to be preached by Israel to the whole world, they were given sabt. Surely they would’ve preached other people to do this act of worship too. So it can’t be for a specific culture or time since it was for all humans it seems