Levi in Fausset's Bible Dictionary
1. Jacob's third son by Leah, ("joined"), expressing her
trust; "now will my husband be joined unto me, because I have
borne him three sons" (Genesis 29:34). Levi joined Simeon in
avenging their own full sister Dinah's wrong by treacherously
slaying the Shechemites, and so incurred Jacob's curse. They
made circumcision, which God gave as a pledge of His holy
covenant, the instrument of hypocrisy and bloody revenge.
Jacob's moral weakness, in reproaching his sons not with the
treacherous murder but with exposing him to danger ("ye have
troubled me to make me to stink among the inhabitants of the
land"), is faithfully delineated (Genesis 34). On his death
bed he took a less selfish and juster view of their deed
(Genesis 49:5-7): "Simeon and Levi are brethren" in character
as in birth, "instruments of wickedness are their swords
(Hebrew). O my soul, come not thou into their secret"
(deliberative council), renounce all fellowship with their
act; "mine honour" (glory, my spirit, which is man's glory,
the center of his personality framed in God's image);" for in
their anger they slew a man and in their wantonness (Hebrew)
houghed an ox."...