It is permissible
to gradually convey the Message of Islam to others, acting upon the Hadith of
Mu‘adh when the Prophet (peace be upon him) delegated him to convey Islam to the people of
Six Hadith Compilers (Al-Bukhari, Muslim, Abu Dawud, Al-Tirmidhy, Al-Nasa’y, and Ibn Majah) reported
Ibn ‘Abbas (may Allah be pleased with him and his father) that the Messenger of Allah (peace be upon him) told
Mu‘adh ibn Jabal when he sent him to
You are going to People of Scripture. When you reach them, call them to testify that there is no god but Allah and that Muhammad is the Messenger of Allah. If they obey you in this, inform them that Allah has enjoined on them five Salahs (to be offered) throughout every day and night. If they obey you in this, inform them that Allah has enjoined on them Sadaqah (obligatory charity) to be taken from the rich among them and given to the poor among them. If they obey you in this, beware (not to take as obligatory charity) their precious property. And fear the supplication of a wronged person, for there is no barrier between them and Allah.
(Part No. 12; Page No. 238) As for Islamic legislation, it has come to an end by the death of the Prophet (peace be upon him). Allah (Exalted be He) says:
This day, I have perfected your religion for you, completed My Favour upon you, and have chosen for you Islâm as your religion.