preaching at the last minute

Yesterday was Sunday.  I got a phone call in the morning from the pastors wife telling me that the pastor was ill and I would have to lead the meeting.  I decided to use notes that I had written for a previous message I delivered to OM on Genesis 27 where Jacob deceives his father Isaac into giving him the birthright.  I posed the question.  Is it ever right to deceive to accomplish the will of God?  God had revealed that the older would serve the younger.  was it therefor neccessary to carry out the deceit to achieve that?