Then it shall be when
yowm (yome)
a day (as the warm hours),
he maketh his sons
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
to inherit
nachal (naw-khal')
to inherit (as a (figurative) mode of descent), or (generally) to occupy; causatively, to bequeath, or (generally) distribute, instate
that which he hath that he may
yakol (yaw-kole')
to be able, literally (can, could) or morally (may, might)
not make the son
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of the beloved
'ahab (aw-hab')
to have affection for (sexually or otherwise) -- (be-)love(-d, -ly, -r), like, friend.
firstborn
bakar (baw-kar')
make firstborn, be firstling, bring forth first child (new fruit).
before
paniym (paw-neem')
the face (as the part that turns); used in a great variety of applications (literally and figuratively); also (with prepositional prefix) as a preposition (before, etc.)
the son
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of the hated
sane' (saw-nay')
to hate (personally) -- enemy, foe, (be) hate(-ful, -r), odious, utterly.
which is indeed the firstborn
bkowr (bek-ore')
firstborn; hence, chief -- eldest (son), firstborn(-ling).