His advice follows the violence that has taken over some parts of the country including southern Kaduna.
While some people describe the mayhem as having to do with the Fulani herdsmen and the natives, others think it is religious.
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Apart from the admonition to preach peace, the emir asked the Islamic clerics to work towards having harmonious co-existence with people of other religions.
According to him, hate preaching is against the tenets of Islam.
The Punch reports that the emir said this while giving a sermon at the inauguration of an ultra-modern mosque at the Federal University of Technology, Minna, Niger state, on Friday, January 28, 2017.
He frowned against a situation where some Muslim clerics use the opportunity of their positions to set one part of the society against the other.
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“Muslim clerics, and indeed all Muslims, should preach peace among the adherents and work to achieve peace with members of other religions,” Sanusi reportedly said.