Convey from me even if it be one ayah
THE Prophet (peace be upon him) said: "Convey from me even if one ayah (verse) for it may be that the one being informed will comprehend better that the one listening (at present)." (Al-Bukhari)
We learn from these words of wisdom that this Hadith encompasses the entire religion of Islam with respect to speech, belief and actions. Likewise, from the perspective of acting upon it with knowledge and from the perspective of calling towards it as much as one is able to. The Prophet (peace be upon him) implemented all of this – by speech, action, belief and giving Da'wah, i.e. his entire life was based on knowledge, acting on knowledge, and calling towards it.
Regarding this, Allah said: "Invite (mankind, O Muhammad, peace be upon him) to the way of your Lord (i.e. Islam) with wisdom (i.e. with the Divine Revelation and the Qur'an) and fair preaching, and argue with them in a way that is better. Truly, your Lord knows best who has gone astray from His path, and He is the Best Knower of those who are guided." (Qur'an, 16:125)
Da'wah was the mission of all Prophets, from the first to the last of them. All of them called people to Allah's religion. Their manhaj (methodology) was knowledge, implementation, application, and propagation. They called people by their speech and by their actions, because people are such that if you call them by speech which your actions contradict, they will not accept that Da'wah.
When you give Da`wah and your actions agree with what you are calling to, then people will accept the message.
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