Sforno on Numbers 27:19/ספורנו על במדבר כ״ז:י״ט

1וצויתה אותו לעיניהם, you appoint him as leader in their very presence so that they will accept his authority willingly and will be obedient to his directives. The expression צווי meaning appointment is not unique; we find it in Samuel I 25,30 וצוך לנגיד, “He will appoint you as leader.” (Avigail speaking to David) We find it also in Samuel II 7,11 למן היום אשר צוותי שופטים, “from the day I have appointed Judges, etc.” (G’d giving a message to the prophet Nathan for David)