Election Commission questioned Adityanath about the alleged hate remarks made to voters ahead of by-elections to nine assembly seats and one parliamentary constituency.
In September last year, nearly 60 people were killed and 40,000 displaced after deadly Hindu-Muslim riots in western Uttar Pradesh's Muzaffarnagar. Investigations found politicians across parties, including some from the BJP, had fueled violence with incendiary speeches.
Ahead of the by-elections in Uttar Pradesh, local BJP leaders have been trying to polarise voters through a campaign that alleges "love jihad" - a term used by right-wing groups for what they describe as an Islamist strategy to convert Hindu women through seduction, marriage and money.
The state BJP has also been referring to forced conversions as a campaign issue.