Let their way
derek (deh'-rek)
a road (as trodden); figuratively, a course of life or mode of action, often adverb
be dark
choshek (kho-shek')
the dark; hence (literally) darkness; figuratively, misery, destruction, death, ignorance, sorrow, wickedness -- dark(-ness), night, obscurity.
and slippery
chalaqlaqqah (khal-ak-lak-kaw')
something very smooth; i.e. a treacherous spot; figuratively, blandishment -- flattery, slippery.
and let the angel
mal'ak (mal-awk')
a messenger; specifically, of God, i.e. an angel (also a prophet, priest or teacher) -- ambassador, angel, king, messenger.
of the LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
persecute
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).
them