Commentary of Charles Spurgeon, Adam Clarke & Matthew Henry
But he was wounded for our transgressions, 
he was bruised for our iniquities:
the chastisement of our peace was upon him;
and with his stripes we are healed.
Vs.5
He was wounded for our
transgressions, to make atonement for them and to purchase for us the pardon
of them. 
Our sins were the thorns in his head, the nails in his hands and feet,
the spear in his side.
--Wounds and bruises were the consequences of sin, what we
deserved and what we had brought upon ourselves.
--That these wounds and
bruises, though they are painful, may not be mortal, Christ was wounded for
our transgressions, was tormented or pained (the word is used for the pains
of a woman in travail) for our revolts and rebellions.
--He was bruised, or
crushed, for our iniquities; they were the procuring cause of his death.
He was cut off for the iniquity of my people, unto whom the
stroke belonged, or was due. He was delivered to death for our
offences. Rom. 4:25.
Hence it is confirmed by the angel's prediction
of the Messiah's undertaking, solemnly delivered to Daniel, that he shall finish
transgression, make an end of sin, and make reconciliation for iniquity.
Dan. 9:24.
--The consequence of this to us is our peace and healing,---Hereby we have peace: The chastisement of our peace was upon him;
--By his stripes
(that is, the sufferings he underwent) he purchased for us the grace
of God to mortify our corruptions.
Sin is not only a crime, for which we were condemned to die and which Christ
purchased for us the pardon of, but it is a disease, which tends directly to the
death of our souls and which Christ provided for the cure of.
