Dawa is an obligatory duty (Fard) for all Muslims. Here is a verse from the Quran which proves it.

"Here are some references from the Quran which prove dawa is a duty of all Muslims:

Invite (all) to the Way of your Lord with wisdom and beautiful preaching; and reason with them in ways that are best and most gracious: surely your Lord best knows those who go astray from His path, and He knows best those who follow the right way." (Quran 16:125)

Dawa is an obligatory duty (Fard) for all Muslims. Here is a verse from the Quran which proves it.

"And it is thus that We appointed you to be the community of the middle way, so that you might be witnesses before all mankind and the Messenger might be a witness before you." (Quran 2:143)

Dawa is an obligatory duty (Fard) for all Muslims. Here is a verse from the Quran which proves it.

"You are now the best people brought forth for (the guidance and reform of) mankind. You enjoin what is right and forbid what is wrong and believe in Allah." (Quran 3:110)

Dawa is an obligatory duty (Fard) for all Muslims. Here is a verse from the Quran which proves it.

"Who is better in speech than one who calls (people) to Allah, works righteousness, and says, "I am of those who bow in Islam"? The good deed and the evil deed are not alike. Repel the evil deed with one which is better: Then will he between whom and thee was hatred become as it were your friend and intimate! And no one will be granted such goodness except those who exercise patience and self-restraint,- none but persons of the greatest good fortune." (Quran 41:33-35)

Dawa is an obligatory duty (Fard) for all Muslims. Here is a verse from the Quran which proves it.

"I swear by the time,

Most surely man is in loss,

Except those who believe and do good, and enjoin on each other Truth, and enjoin on each other endurance." (Quran 103:1-3)