John Gill Commentary Numbers 27:8

"And thou shalt speak unto the children of Israel, saying, If a man die, and have no son, then ye shall cause his inheritance to pass unto his daughter." — Numbers 27:8 (ASV)

And you shall speak unto the children of Israel
The above affair occasioned a law to be made, in which all the people would have a concern, among whom such cases should happen, as after related:

saying, if a man die, and have no son, then you shall cause his
inheritance to pass unto his daughter ;
as in the above case of the daughters of Zelophehad; what was determined as to their particular case was made into a general law.