John Gill Commentary Numbers 15:23

"even all that Jehovah hath commanded you by Moses, from the day that Jehovah gave commandment, and onward throughout your generations;" — Numbers 15:23 (ASV)

[Even] all that the Lord has commanded you by the hand of
Moses
Recorded in this book and the two preceding, whether of a moral, ceremonial, or judicial kind; the whole body of laws given to the people of Israel from the Lord by Moses:

from the day that the Lord commanded [Moses], and henceforward among
your generations ;
all that he had commanded, or should hereafter command.