"I appeal to the brothers n sisters of Bihar to vote to make Nitish ji the CM of Bihar," Kejriwal tweeted.
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Kejriwal, who has openly backed Kumar's candidature since the beginning of the electoral campaign, had earlier claimed that the BJP, led by Prime Minister Narendra Modi, was all set to receive a drubbing in the elections.
Making common cause against Modi, Kejriwal had extended full support to his Bihar counterpart's candidature at a conclave organised by the Delhi government in the capital in August.
However, he did not campaign for the JD(U) in the ongoing polls.
50 of the state's 243 assembly seats spread over six districts-- Patna, Vaishali, Saran, Nalanda, Bhojpur and Buxar-- are going to polls in the third phase of the 5-phased polls. Polling has already been held in 81 assembly seats in the first two phases.