At first...
At first, the invitation of the Prophet (S) was to the family members, then to the people of’Umm-ul-Qur’ā, Mecca, and, finally, to the whole humankind. The verse says: “Say: ‘O mankind! I am the messenger of Allah to you all, of Him to Whom belongs the Sovereignty of the heavens and the earth. There is no god but He. He gives life. And makes to die’…” Another matter is that prophethood is something necessary for Theism and Resurrection.
Since Allah (s.w.t.) is the only possessor of the world of existence thoroughly, and life and death are under His control, then the leadership and guidance of human beings should be authorized by Him, too.
“And of the people of Moses there is a group who guide by the truth and establish justice thereby.”*** Guiding by the truth is a sign of the absence of bigotry, and also an indication of gratitude and following the truth itself. So, this recent group, whom are referred to in this verse, were separate from the pertinacious ones who used to seek pretexts.
The holy verse says: “And of the people of Moses there is a group who guide by the truth…” Perhaps, the objective meaning referred to this group is those people among the Jews who accepted the invitation of the Messenger of Allah (S). Therefore, in confronting the minorities, justice should particularly be observed, and their sincere services and accomplishments must not be neglected.