The king's
melek (meh'-lek)
a king -- king, royal.
heart
leb (labe)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect
is in the hand
yad (yawd)
a hand (the open one (indicating power, means, direction, etc.),
of the LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
as the rivers
peleg (peh'-leg)
a rill (i.e. small channel of water, as in irrigation) -- river, stream.
of water
mayim (mah'-yim)
water; figuratively, juice; by euphemism, urine, semen -- + piss, wasting, water(-ing, (-course, -flood, -spring).
he turneth
natah (naw-taw')
to stretch or spread out; by implication, to bend away (including moral deflection); used in a great variety of application (out), stretch (forth, out), take (aside), turn (aside, away), wrest, cause to yield.
it whithersoever he will
chaphets (khaw-fates')
to incline to; by implication (literally but rarely) to bend; figuratively, to be pleased with, desire