Because
`eqeb  (ay'-keb)
a heel, i.e. (figuratively) the last of anything (used adverbially, for ever); also result, i.e. compensation; and so (adverb with preposition or relatively) on account of -- because, by, end, for, if, reward.
that Abraham
'Abraham  (ab-raw-hawm')
father of a multitude; Abraham, the later name of Abram -- Abraham.
obeyed
shama`  (shaw-mah')
to hear intelligently (often with implication of attention, obedience, etc.; causatively, to tell, etc.)
my voice
qowl  (kole)
from an unused root meaning to call aloud; a voice or sound
and kept
shamar  (shaw-mar')
to hedge about (as with thorns), i.e. guard; generally, to protect, attend to, etc.
my charge
mishmereth  (mish-mer'-reth)
watch, i.e. the act (custody), or (concr.) the sentry, the post; obj. preservation, or (concr.) safe; fig. observance, i.e. (abstr.) duty or (obj.) a usage or party -- charge, keep, or to be kept, office, ordinace, safeguard, ward, watch.
my commandments
mitsvah  (mits-vaw')
a command, whether human or divine (collectively, the Law) -- (which was) commanded(-ment), law, ordinance, precept.
my statutes
chuqqah  (khook-kaw')
appointed, custom, manner, ordinance, site, statute.
and my laws
towrah  (to-raw')
a precept or statute, especially the Decalogue or Pentateuch -- law.


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