O house
bayith  (bah'-yith)
a house (in the greatest variation of applications, especially family, etc.)
of Aaron
'Aharown  (a-har-one')
Aharon, the brother of Moses -- Aaron.
batach  (baw-takh')
to hie for refuge; figuratively, to trust, be confident or sure -- be bold (confident, secure, sure), careless (one, woman), put confidence, (make to) hope, (put, make to) trust.
in the LORD
Yhovah  (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
he is their help
`ezer  (ay'-zer)
aid -- help.
and their shield
magen  (maw-gane')
a shield (i.e. the small one or buckler); figuratively, a protector; also the scaly hide of the crocodile -- armed, buckler, defence, ruler, + scale, shield.