For length
'orek  (o'rek')
length -- + forever, length, long.
of days
yowm  (yome)
a day (as the warm hours),
and long
shaneh  (shaw-neh')
a year (as a revolution of time) -- + whole age, long, + old, year(-ly).
life
chay  (khah'-ee)
age, alive, appetite, (wild) beast, company, congregation, life(-time), live(-ly), living (creature, thing), maintenance, + merry, multitude, + (be) old, quick, raw, running, springing, troop.
and peace
shalowm  (shaw-lome')
safe, i.e. (figuratively) well, happy, friendly; also (abstractly) welfare, i.e. health, prosperity, peace
shall they add
yacaph  (yaw-saf')
to add or augment (often adverbial, to continue to do a thing)
to thee


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