These also [are] the generations of Aaron and
Moses
The descendants of them, those of the former, who is named first,
because the eldest, were priests, and those of the latter
Levites, and who are not very plainly pointed at, but are
included among the Amramites, ( Numbers 3:27
) ; the posterity of Moses being very obscure, only Levites, and
these not particularly named but swallowed up among the
Kohathites: find the following account was as it stood,
in the day [that] the Lord spoke with Moses in mount
Sinai;
and not, altogether as it then, was when he spoke to him in the
wilderness, of Sinai, for then Aaron had four sons, but now two
of them were dead as is after observed; and it seems to be for
the sake of this circumstance chiefly that this clause is so put.