The methodology of Da'wah is Tawqeefiyyah

Ash-Shaykh (Dr.) Saalih bin Fawzaan al-Fawzaan said:

“The manaahij (methodologies) of da’wah are tawqeefiyyah (they only come by texts), clarified and explained in the Book and the Sunnah and the seerah of the Messenger of Allaah (Sallallaahu ‘alayhi wasallam). We do not invent in to it anything from ourselves. And they are found in the Book of Allaah and the Sunnah of His Messenger (Sallallaahu ‘alayhi wasallam). So then if we invent (something new from ourselves) we will be lsot and will have caused others to be lost. He said (Sallallaahu ‘alayhi wasallam): “Whoever innovates into this affair of ours (the Deen of Islaam) that is not from it, then it it is rejected.” [al-Bukhaaree(2697) and Muslim (1718) from ‘Aa’ishah (radiyallaahu ‘anhaa)]

Yes, there are wasaa’il (means and ways) that are used for the da’wah today that were not present before, like loudspeakers, radio stations, newspapers and magazines, rapid means of communication (like the Internet) and satellites. So these are called “wasaa’il”, used for benefit in spreading the da’wah. And they are not called “manaahij”. So as for the manaahij, Allaah the Most High has clarified by His saying:

“Invite to the Way of your Lord with hikmah (wisdom) and fair preaching, and argue with them in a way which is best.” [An-Nahl (16):125]

And the saying of Allaah the Most High:

“Say (O Muhammad): "This is my way; I invite unto Allaah with baseerah (sure knowledge), I and whosoever follows me." [Yoosuf (12):108]

And I the seerah of the Prophet (Sallallaahu ‘alayhi wasallam) in da’wah in Makkah and al-Madeenah (is) what clarifies the manaahij of da’wah.”

Al-Ijaabaatul-Muhimmatu feel-Mashaakilil-Mulimmah (pg. 174-175, #139)