(Bamidbar 7:12) "And the one who presented his offering on the first day": What is the intent of this? "first" of all the days of the year (i.e., the first of Nissan). "Nachshon ben Aminadav of the tribe of Judah": Is the intent of this attribution to link him with his tribe or to indicate that he obtained (the offering) from his tribe and brought it? It is, therefore, written (Ibid. 17) "This is the offering of Nachshon ben Aminadav" — his personal offering and not his tribe's. What, then, is the intent of Nachshon ben Aminadav of the tribe of Judah"? To link him with his tribe.