Condition criteria Eligibility for Dawah Tabligh Preaching work

So all Muslim will give DAWAH  WITH A CONDITION…………
…….the content of dawah or preaching SHOULD BE  
within the limit of his/her knowledge.
Shaikh Salih Ibn Uthaimeen Rahimahullah has clearly explained in his Fatwa . He says…….
[Fatawa Ulama al-Balad al-Haraam (p. 329)]
“If a person understands what he is calling people to, it makes no difference whether he is a great and prominent scholar or a seeker of knowledge who is serious in his pursuit or a normal person who has certain knowledge of the issue in question.
The Messenger (peace and blessings of Allaah be upon him) said: “Convey from me, even if it is one verse,” and he did not stipulate that the daa’iyah (caller) should have reached a high level of knowledge, 
but it is essential that he should have knowledge of that to which he is calling people.
But calling out of ignorance or calling based on emotion is not permissible.”
[Fatawa Ulama al-Balad al-Haraam (page No. 329)
He /she should not spread something he is not knowing.HE SHOULD APPLY WISDOM and Hikmah and should remain within his/her knowledge about content of Dawah.
Quran has not said that Only person with a particular position/degree will give Dawah. Alim/Non Alim all will give Dawah but according to his ability and knowledge. Even an Alim has a limitation if he will start giving verdict like a Mujtahid/Mufti/Imam he is crossing limit. Similarly if a normal person start giving Masael/Islamic Rulings/interfering with Ulema jurisdiction he is doing wrong

2.There is no limit of Knowledge.No one can say that this much time/this much syllabus is having complete knowledge of Islam. 
 Quran and Ahadith has not specified the limit of knowledge.