He was 76 and is survived by two sons and three daughters.
A former state president of Jamiat Ulema-e-Hindi and member of the All India Muslim Personal Law Board, Qasmi had won the Kishanganj seat for the first time in 2009 Lok Sabha polls and went on to retain the seat five years later.
In his condolence message, Bihar Chief Minister Nitish Kumar said "Qasmi was known for probity in politics and his simplicity of heart. He was deeply interested in social work and enjoyed immense popularity in his constituency.
"He had also played an important role in establishment of an extension campus of Aligarh Muslim University extension campus in Kishanganj."
The chief minister announced that Qasmis last rites will be performed with full state honours.
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