For all the people
`am (am)
a people (as a congregated unit); specifically, a tribe (as those of Israel); hence (collectively) troops or attendants; figuratively, a flock -- folk, men, nation, people.
and all Israel
Yisra'el (yis-raw-ale')
he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
understood
yada` (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially
that day
yowm (yome)
a day (as the warm hours),
that it was not of the king
melek (meh'-lek)
a king -- king, royal.
to slay
muwth (mooth)
causatively, to kill
Abner
'Abner (ab-nare')
father of light (i.e. enlightening); Abner, an Israelite -- Abner.
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 Ner
Ner (nare)
lamp; Ner, an Israelite -- Ner.