'echad  (ekh-awd')
united, i.e. one; or (as an ordinal) first
'iysh  (eesh)
a man as an individual or a male person; often used as an adjunct to a more definite term (and in such cases frequently not expressed in translation)
of you shall chase
radaph  (raw-daf')
to run after (usually with hostile intent; figuratively (of time) gone by) -- chase, put to flight, follow (after, on), hunt, (be under) persecute(-ion, -or), pursue(-r).
a thousand
'eleph  (eh'-lef)
hence (the ox's head being the first letter of the alphabet, and this eventually used as a numeral) a thousand -- thousand.
for the LORD
Yhovah  (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
your God
'elohiym  (el-o-heem')
angels, exceeding, God (gods)(-dess, -ly), (very) great, judges, mighty.
he it is that fighteth
lacham  (law-kham')
to feed on; figuratively, to consume; by implication, to battle (as destruction) -- devour, eat, ever, fight(-ing), overcome, prevail, (make) war(-ring).
for you as he hath promised
dabar  (daw-bar')
perhaps properly, to arrange; but used figuratively (of words), to speak; rarely (in a destructive sense) to subdue