The father of human beings, Adam, was the first to preach Allah’s word to humankind on the earth.
The Qur’an says:
Allah chose Adam, Noah, the family of Abraham and the family of Imran above the mankind and jinn (of their times.)
Qur’an 3:33
A man asked Prophet Muhammad (PBUH):
Ibn Hibban 6190
“O Messenger of Alläh! Was Adam a prophet?”
The Prophet (PBUH) said:
“Yes and Allah spoke to him!”