What is R. Akiva's reason? It says here about a false Navi Yumas, and it says [about a Zar who serves "veha'Zar ha'Karev Yumas'' - it is better to learn Yumas from Yumas, and not to learn Yumas from Yamos (said regarding Korach's congregation. They were killed bi'Ydei Shamayim.)

What is Rabanan's reason? It says here [about a Zar who serves] "Yumas'', and it says about Korach's congregation] "Yamus''. (We should learn a commoner from a commoner, and not from a Navi.