And We did not send before you, any messenger or prophet, but when he desired (something) the devil put into his desire (some evil, as he normally does with human beings). Therefore Allah (first) wipes off that which the devil puts (into the desires of messengers and prophets and) then Allah establishes His signs (Divine communication), Allah is Knowing, Wise,
The devil normally instigates evil into the desires of human beings. Allah (SWT) first wipes out these evil instigations from the desires of His messengers and then communicates His message. This information is being communicated because the learned may know that His message does not get mixed up with the evil instigations of the devil but remains pure. The evil instigations of the devil become a temptation only for those in whose hearts are diseases like, hypocrisy, polytheism, infidelity etc and whose hearts are hard i.e. they do not absorb the message of Allah (SWT).