I noticed something strange in Shemot 12:43-50. I always assumed the commandments given there were for future generations (like most commentators teach). But then it says in verse 43: "And HaShem said to Moshe and Aharon.." followed by 47: "all the congregation of Israel shall keep it" and in verse 50 "thus did all the children of Israel, as HaShem commanded Moshe and Aharon".
Does this mean that at that moment in Egypt other people could join? I find this strange, but then again a mixed multitude went with them (verse 38).
(P.s. Rashi - according to the Sefaria website - teaches that this chapter was spoken to them on the 14th day of Nisan)