Rejoice not against me, O mine enemy: when I fall, I shall arise; when I sit in darkness, the LORD shall be a light unto me.
Rejoice not against me - at my fall.
O mine enemy - as Babylon, Edom, etc., were to Israel. A type of the great enemy of the believer and of the Church, Satan. The time shall come when the Church shall similarly say to him, "O thou enemy, destructions are come to a perpetual end" (Psalms 9:6).
When I sit in darkness, the Lord shall be a light unto me. Israel reasons as her divine representative, Messiah, reasoned by faith, in His hour of darkness and desertion (Isaiah 50:7-8; Isaiah 50:10). Israel addresses Babylon, her triumphant foe (or Edom), as a female: the type of her last and worst foes (Psalms 137:7-8). "Mine enemy," in Hebrew х 'oyabtiy (H341)] is feminine.
When I fall, I shall arise - (Psalms 37:24; Proverbs 24:16).