Is Da'wah Farz ???
ALLAAH (SWT) says in the Holy Qur'an in Surah Aal-e-Imran, Chapter number 03, Verse number 104:
"Let there arise out of you a group of people inviting to all that is good, enjoining what is right and forbidding what is wrong, and it is they who are succesful."
ALLAAH (SWT) further says in Surah Nahl, Chapter number 16, Verse number 125:
"Invite (all) to the way of your Lord with wisdom and beautiful preachings and argue with them in ways that are best and most gracious."
ALLAAH (SWT) further says in Surah Qasas, Chapter number 28, Verse number 87:
"Let no one turn you away from the revelations of Allah after they have been revealed to thee: and invite (men) to thy Lord, and be not of the company of those who join gods with Allah."
ALLAAH (SWT) further says in Surah Fussilat, Chapter number 41, Verse number 33:
"And who is better in speech than he who invites (all) to Allah and does righteous deeds and says,'I am one of the Muslims'."
And ALLAAH (SWT) further says in Surah Al-Asr, Chapter number 103:
Verse number 01: "By the Time."
Verse number 02: "Indeed! man is in a loss."
Verse number 03: "Except those who have faith and do good works and encourage one another to Truth and encourage one another to patience."
From the above quoted verses of the Holy Qur'an it becomes clear that doing Da'wah is a Farz for every Muslim.