Muhammad didn't say anything in the Koran, it's God words translated by Gabriel.....it clearly says before Muhammad certain Jews didn't observe the sabbath and were turned into apes....that's the Abrahamic God....
The Bible has a load of similar punishing verses such as the Lot homosexuals, the teenage boys that bullied this one kid in the Bible and God sent a bear to kill them....sounds like the Abrahamic God....
Too bad, you can't come up with excuses for this, no matter how much you try.....poor guy.....he only wishes what he says is true.....
From what I hear muslims don't have a Sabbath, a day of rest. Sat is the seventh day anyway