Narrated Ka`b bin Malik: Whenever Allah's Apostle intended to lead a Ghazwa, he would use an equivocation from which one would understand that he was going to a different destination .

Narrated Ka`b bin Malik: I said, "O Allah's Apostle! For the acceptance of my repentance I wish to give all my property in charity for Allah's sake through His Apostle ." He said, "It is better for you to keep some of the property for yourself." I said, "Then I will keep my share in Khaibar."

Narrated Ka`b bin Malik: Whenever Allah's Apostle intended to carry out a Ghazwa, he would use an equivocation to conceal his real destination till it was the Ghazwa of Tabuk which Allah's Apostle carried out in very hot weather. As he was going to face a very long journey through a wasteland and was to meet and attack a large number of enemies. So, he made the situation clear to the Muslims so that they might prepare themselves accordingly and get ready to conquer their enemy. The Prophet informed them of the destination he was heading for.