Positive commandment · Mitzvat Aseh #248 of 613
To render judgment [in questions] regarding inheritances
לדון בדיני נחלות
The verse · Bamidbar 27:8
וְאֶל־בְּנֵי יִשְׂרָאֵל תְּדַבֵּר לֵאמֹר אִישׁ כִּי־יָמוּת וּבֵן אֵין לוֹ וְהַעֲבַרְתֶּם אֶת־נַחֲלָתוֹ לְבִתּוֹ
“And thou shalt speak to the children of Yisra᾽el, saying, If a man die, and have no son, then you shall cause his inheritance to pass to his daughter.”
The Rambam’s words
To render judgment [in questions] regarding inheritances as [Numbers 27:8] states: "If a person dies without having a son...."
לדון בדיני נחלות, שנאמר: "איש כי ימות, ובן אין לו" (במדבר כז,ח).
Why · Sefer HaChinuch #400
Laws of inheritance
“It is from the root of the commandment [that it is] so that a person should reflect that the world is in the hand of the Master that oversees all of His creatures, and it is in His desire and His goodly will, that each and every person acquires the portion of possessions that he attains in this world.”
Who & when
“And it is practiced in every place and at all times by males and females.”
Where in the Mishneh Torah
Hilchot Inheritances הלכות נחלות