The issue reached the apex court as the man challenged the annulment of the marriage by the Kerala High Court which ordered the state police to probe such cases.
The top court said it was entrusting the task to the National Investigation Agency (NIA) as a neutral agency to get a "whole picture" and ascertain whether the particular instance was limited to a "small pocket" or was there "something wider" to the issue.
The court said that it felt that "the petitioner (Jahan) does not desire the correct and independent view of the controversy" be brought before it.
"The Kerala Police is directed to render all assistance and cooperation to the NIA," the bench said, noting that a copy of its order be given to the state police.
The court issued notice to Jahan and others including the state police on the NIA plea and fixed it for hearing at 2 pm.
The bench, which allowed Jahan to file his response to the NIA's plea, said that the central probe agency would not be able to assist the police in a fair manner if it was not allowed access to the probe records.
It said, "We are not going by the catch word (love jihad) used in social media" and rather wanted to ascertain whether it was a "small pocket incident" or there was something more to it.
"Why should you doubt the NIA? We have not asked it to investigate. We have asked it to look at the records and assist us... You (Jahan) want the order without anybody looking at the records. This is not fair. This is a government agency and we asked it to help us," the court said.
The woman, a Hindu, had converted to Islam and later married Jahan.
It was alleged that the woman was recruited by Islamic State's mission in Syria and Jahan was only a stooge.
Earlier, the apex court had sought a response of the NIA and the Kerala government on the plea of Jahan
Ashokan K M, the father of the woman, had alleged that there was a "well-oiled systematic mechanism" for conversion and Islamic radicalisation.
The NIA has recently conducted probe into some cases of 'love jihad' in which women were allegedly being sent to Syria to join ISIS.
The high court, while declaring the marriage as "null and void", had described the case as an instance of 'love jihad' and ordered the state police to conduct probe into such cases.
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