Isa. 48:18 KJV (With Strong’s)

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18
O that
luw' (Hebrew #3863)
or luw {loo}; a conditional particle; if; by implication (interj. as a wish) would that!
KJV usage: if (haply), peradventure, I pray thee, though, I would, would God (that).
Pronounce: loo
Origin: or lu {loo}
p thou hadst hearkened
qashab (Hebrew #7181)
to prick up the ears, i.e. hearken
KJV usage: attend, (cause to) hear(-ken), give heed, incline, mark (well), regard.
Pronounce: kaw-shab'
Origin: a primitive root
to my commandments
mitsvah (Hebrew #4687)
a command, whether human or divine (collectively, the Law)
KJV usage: (which was) commanded(-ment), law, ordinance, precept.
Pronounce: mits-vaw'
Origin: from 6680
! then had thyq peace
shalowm (Hebrew #7965)
from 7999; safe, i.e. (figuratively) well, happy, friendly; also (abstractly) welfare, i.e. health, prosperity, peace
KJV usage: X do, familiar, X fare, favour, + friend, X great, (good) health, (X perfect, such as be at) peace(-able, -ably), prosper(-ity, -ous), rest, safe(-ty), salute, welfare, (X all is, be) well, X wholly.
Pronounce: shaw-lome'
Origin: or shalom {shaw-lome'}
been as a river
nahar (Hebrew #5104)
a stream (including the sea; expec. the Nile, Euphrates, etc.); figuratively, prosperity
KJV usage: flood, river.
Pronounce: naw-hawr'
Origin: from 5102
, and thy righteousness
tsdaqah (Hebrew #6666)
rightness (abstractly), subjectively (rectitude), objectively (justice), morally (virtue) or figuratively (prosperity)
KJV usage: justice, moderately, right(-eous) (act, -ly, -ness).
Pronounce: tsed-aw-kaw'
Origin: from 6663
as the waves
gal (Hebrew #1530)
something rolled, i.e. a heap of stone or dung (plural ruins), by analogy, a spring of water (plural waves)
KJV usage: billow, heap, spring, wave.
Pronounce: gal
Origin: from 1556
of the sea
yam (Hebrew #3220)
a sea (as breaking in noisy surf) or large body of water; specifically (with the article), the Mediterranean Sea; sometimes a large river, or an artifical basin; locally, the west, or (rarely) the south
KJV usage: sea (X -faring man, (-shore)), south, west (-ern, side, -ward).
Pronounce: yawm
Origin: from an unused root meaning to roar
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Cross References

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that thou.
then had.

J. N. Darby Translation

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18
Oh that thou hadst hearkened to my commandments! Then would thy peace have been as a river, and thy righteousness as the waves of the sea;