He also reached out to voters from Bihar and Eastern Uttar Pradesh saying that "entire Delhi will come to halt if the outsiders stop working."
Kumar's party JD (U), which is in power in Bihar, is contesting 27 of the 70 assembly seats in this election.
The Bihar Chief Minister is on a two-day visit to Delhi. Kumar addressed three election rallies in Dwarka, Sangam Vihar and Okhla today and will be addressing three more rallies in Kiradi Burari and Ghoda on Sunday, party general secretary Javed Raza said.
"Those who call the outsiders a burden should know that Delhi belongs to all and everybody has equal right on it. They should understand that these people are not a burden but insteady they are carrying the burden. If these people stop carrying this burden for one day, entire Delhi will halt.
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"These are the people, who play a key role in constructing the grand buildings in Delhi but they are living without basic amenities," he said.
Without naming Modi, Kumar, who is a known detractor of the BJP's Prime Ministerial candidate said, "our country is inhabited by people from varoious caste, creed and religion. Only a person who can carry along with him all sections of the society can run this country. The policies, which are being sought to be thrust on the nation are not a good omen.