Jim W. Goll in his book, Kneeling on the Promises, talks about the need to "close the door on the backlash of spiritual warefare" (pg. 249). The following is a prayer Goll offers up after engaging in a powerful encounter with the enemy.

Protection

Prayer:

In the name of Jesus, and by the power of His blood shed on the cross, I command the penalty of the enemy, any word curse that has that has been pronounced against me and any backlash of the evil one sent against me and my family, to be broken. It shall not prosper as I nullify its effect in Jesus' mighty name. I proclaim a blessing to all that I am, hope to be and put my hand to, and to all that pertains to my life, health, home, finances, ministry and family. I call forth strength, vigor, protection and the supply of the Lord, for the honor and glory of His name. Amen.

Source: Kneeling on the Promises by Jim W. Goll (Baker Book House Company - 1999)