Arvind Kejriwal has been asked to submit the evidence by Monday.
Mr Kejriwal had last month alleged that the BJP threatened his imminent arrest in the Delhi Liquor Police case and spoke to about 21 AAP MLAs, of which seven had been offered ₹ 25 lakh for the switch.
The alleged conversation involved a sinister plan to topple the AAP government in Delhi, Mr Kejrwal had alleged.
"Recently, they [BJP] has contacted 7 of our MLAs of Delhi and said - 'We will arrest Kejriwal after a few days. After that, we will break the MLAs. Talks have been held with 21 MLAs. Talking to others also. After that, we will topple the Aam Aadmi Party government in Delhi. You can also come. Will give ₹ 25 crore and contest the elections on BJP ticket," Mr Kejriwal had posted on X - formerly known as Twitter.