Whenever Allah's Messenger (ﷺ) intended to lead a Ghazwa, he would use an equivocation from which one would understand that he was going to a different destination .
Sahih al-Bukhari Book 56, Hadith 159
← Previous Hadith Allah 's Apostle said, " I have been ordered to fight with the people till they say, 'None has the right to be worshipped but Allah,' and whoever says, 'None has the right to be worshipped but Allah,' his life and property will be saved by me except for Islamic law, and his accounts will be with Allah, (either to punish him or to forgive him.)"

Sahih al-Bukhari Book 56, Hadith 158 Next Hadith → Whenever Allah's Messenger (ﷺ) 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 Messenger (ﷺ) 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 (ﷺ) informed them of the destination he was heading for.

Sahih al-Bukhari Book 56, Hadith 160