Kharge, 83, recently underwent pacemaker implantation and has been reported as stable. He is expected to resume his official engagements from October 3, according to his son and Karnataka IT Minister, Priyank Kharge.
Prime Minister Narendra Modi spoke to Congress President Mallikarjun Kharge on Thursday and enquired about his health. He also wished him a speedy recovery.
"We don't want to do any politics, and we are here to support the affected families... We will give maximum help in their future endeavours," he added.
On the eighth day of Navratri, also known as Maha Ashtami, devotees worship Goddess Mahagauri, who is the eighth of the nine forms of the goddess Durga.
All India Congress Committee (AICC) President Mallikarjun Kharge is scheduled to visit Kohima on October 7 and address a public rally at Naga Solidarity Park.
"This threat is not just a careless outburst of a petty functionary; it is symptomatic of a deliberately cultivated, toxic atmosphere of hate that renders the LoP vulnerable to mindless violence. As such, any failure by you to act swiftly, decisively and publicly will be judged as complic