Raising the issue during the Zero Hour, Ansari said the government on four occasions in Parliament has given assurance to include Bhojpuri in the 8th Schedule.
In an apparent dig at Prime Minister Narendra Modi, he said that during elections, BJP leaders say a word or sentence in Bhojpuri to allure voters.
Prodded by Deputy Chairman P J Kurien, Ansari also spoke in Bhojpuri amid thumping of benches by members.
He said the Delhi unit of JD-U has written a six-page letter to the Home Minister to include Bhojpuri in the 8th Schedule, which currently recognises 22 languages.
Ansari said Bhojpuri was the language of Kunwar Singh, Sher Shah Suri and represented Hindu-Muslim unity.
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