It has been confirmed in a number of hadith, sahih and hasan, that shaytan is unable to takes the form of our beloved Prophet Muhammad (PBUH) and is unable to present to the seer an image which causes him doubt as to whether it is Prophet PBUH or not. The most famous of these ahadith is what has been reported by al-Bukhari (no.6993) Muslim (no. 2266) and others from the hadith of Hadhrat Abu Hurayrah (RA) who attributed it to the Prophet (PBUH):
 
“Whoever sees me in a dream will see me when awake, or it is as if he has seen me while awake, and shaytan cannot resemble me.”
 
In al-Bukhari (no. 6996) and Muslim (no.2267) from the hadith of Hadhrat Abu Qatadah (RA) who attributed it to the Prophet (PBUH)
 
“whoever sees me (in a vision) has definitely seen me.”
 
And the Prophet (PBUH) said
 
“whoever sees me (in a vision) has seen the truth as Shaytan does not take my Form.”

ISBN:
Author: Mashhur bin Hasan Al Salman and 'Umar bin Ibrahim Al-AbdurRahman, translated by 'AbdulHaq al-Ashanti
Publisher: Darussalam (2013)
Pages: 98
Binding: Paperback