Amid a row over the Yamuna being "poisoned", Haryana Chief Minister Nayab Saini took a sip of water "without hesitation" directly from the river at Delhi's Palla village.

"... I drank the water of the holy Yamuna on the Haryana border. (Delhi Chief Minister) Atishiji did not come. She must be making up a new lie (but) lies have no legs. That is why the lies of AAP-da (the BJP's new pejorative for the Aam Aadmi Party) are not working," he said on X.

"The people of Haryana are not responsible for your failures, you ungrateful son Kejriwal. The people of Haryana are the ones who do pious deeds," he said slamming Kerjiwal.

"On February 5, the people of Delhi are going to finally immerse themselves in all the sins of lies and deceit committed by Kejriwal and his AAP team in the last 10 years, in betraying Mother Yamuna," the Haryana CM claimed.

AAP supremo Arvind Kejriwal, a former Delhi chief minister, made the startling claim just days ahead of the Delhi polls.

The AAP supremo accused the BJP government in Haryana of polluting raw water supply to the national capital.

He also warned that the poisoned water might cause massive casualties in Delhi.

The Delhi Jal Board has rejected Kejriwal's claims and said on X, "The statement of former Chief Minister and present Chief Minister that the Haryana government has released 'poison in the water' is false, misleading, and factually incorrect.

"Such alarmist statements amount to fear mongering. Water in river Yamuna is of the same quality."

The Election Commission of India (ECI) has asked Kejriwal to provide proof supporting his allegation by 8 pm on Wednesday following a BJP complaint.

In its letter, the ECI said the charge was serious, having the potential to create animosity between states while carrying a provision of a three-year jail term.

Kejriwal's AAP has been ruling Delhi, a union territory, uninterrupted since 2015.

While the AAP is aiming for a consecutive third term, Modi's BJP is eyeing a comeback to power after 27 years.