Tabligh (i.e Dawah)

The prophet Muhammad peace be upon him one day delivered an address,and in this address he praised some muslims.
Then he said,'How is it that some people do not help their neighbors in developing knowledge and understanding of Islam,
and do not apprise them of the admonitory aspect of remaining ignorant of religion,and do not restrain them from doing evil.
Why is that people do not learn about Islam from each other and do not ascertain the consequences of remaining ignorant of religion?
I swear by Allah,it is incumbent on every muslim to impart knowledge of Islam,to people,to develop understanding of religion,
to tender advice to them and to tell them good things.'
(Tabrani,Ma'ariful Hadith)

A person told Abdullah Ibn Abbas that he wanted to preach Islam i.e to enjoin what is good and forbid what is evil.He asked,
'Have you acquired that position?'
The person replied,'Yes,it is hoped so.'
Ibn Abbas said,'If you do not apprehend that the three verses of the Holy Quran would not disgrace you then you should certainly
preach islam.'
He asked,'Which are those three verses?'
Ibn Abbas said,'

'DO NOT ENJOIN WHAT IS REPUTABLE AND FORGET YOURSELF.'
(Surah Baqarah)
Ibn Abbas said,'Have you acted on this verse fully?'
The person replied,'No.'

he second verse is;
'WHY DO YOU ENJOIN WHICH THAT YOU DO NOT DO?'
(Surah Saf)
Ibn Abbas asked the person the same question to which he replied in the negative.

The third verse is;
Hadhrat Shu'aib said to his people;
'AND I DESIRE NOT,IN ORDER TO APPOSE YOU,TO DO THAT WHICH I FORBID YOU.'

Ibn Abbas enquired,'Have you acted on this verse fully?'
He said,'No.'
Ibn Abbas said,'Go,first enjoin yourself what is good and restrain yourself from what is evil.'
This is the first step of a preacher.
(Ma'ariful Hadith,Ad-Dawah)

Hadhrat Hudhaifah has reported the prophet peace be upon him as saying;
'By him in whose my hand my soul is you must enjoin what is good and forbid what is evil,
or Allah will certainly send a punishment from himself to you.Then you will make supplication and not receive an answer.'
(Tirmidhi)

Hadhrat Akramah says that Hadhrat Abdullah Ibn Abbas said;
'Deliver a sermon once a week and if you like you can do so twice,but do not deliver sermons more than three times a week,
and do not let the people develop hatred with the Quran.And if it is that you come upon a people and find them busy,
then instead of interrupting,keep your silence and if when you find them inclined to listen then address them and be careful
not to use rhymed phraseology because i have seen the prophet peace be upon him and the companions that they did not like
extra ornamentation in addressings.'
(Bukhari)