On your heart that you may warn.
To reveal it into your heart, that you may be one of the warners.
upon your heart (Prophet Muhammad), in order to be one of the warners
On thy heart that thou mayest be a warner
On your heart/mind to be (E) from the warners/givers of notice
in order to make you a Warner
Upon your heart, for you to convey warning
On thy heart, that thou mayest be a Warner
Upon your (most illumined) heart so that you may be a Warner (to the disobedient)
(Revealing it) to your heart with the result that you became of the Warners (- a Prophet of God)
Upon your heart (O Muhammad SAW) that you may be (one) of the warners