"In every case of trespass...in which one can say: 'This is it'"—Exodus 22:8.
We are commanded to adjudicate monetary cases between litigants [according to the laws outlined in the Torah].
"If a man dies and he has no son..."—Numbers 27:8.
We are commanded regarding the laws of inheritance [to follow the inheritance laws detailed in the Torah]. Included in this mitzvah is that the firstborn receives a double portion from his father's estate.