"I appeal to people to maintain communal harmony as it is a must for development and peace," he said at an official function to mark India's Independence Day.
Mr. Nitish Kumar expressed serious concern over incidents of communal clashes in Nawada district where curfew was imposed four days ago.
He reiterated his demand for special category status to Bihar.
"I appeal to the central government from this platform to grant special category status to Bihar for its fast development and high growth."
The JD(U) leader, who has dumped the BJP after 17 long years, said the Bihar model of development was inclusive.
"(Our) model of development is development with justice to all without any discrimination."
Nitish Kumar said his government had taken several steps to control corruption.
"We have confiscated houses of corrupt officials and turned them into schools for the poorest of the poor."