I will even betroth
'aras (aw-ras')
to engage for matrimony -- betroth, espouse.
thee unto me in faithfulness
'emuwnah (em-oo-naw')
literally firmness; figuratively security; morally fidelity -- faith(-ful, -ly, -ness, (man), set office, stability, steady, truly, truth, verily.
and thou shalt know
yada` (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially
the LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.