Rajendra Hazra, in contrast, states that the core verses of the texts were likely first composed over various centuries, as follows: he dates the Vishnu bhakti focussed text "Brihannaradiya Purana" to the 9th-century; he places the first 41 chapters of "Purvabhaga" and the first 37 chapters of "Uttarabhaga" to have been composed before the 11th century; and, the rest he states is of likely a comparatively later origin. The "Naradiya Purana", states Hazra, was likely composed after the "Brihannaradiya Purana". It is unknown, adds Hazra, whether the extant manuscripts of the Narada Puranas are same as the 9th and 10th-century originals, but we know that the verses quoted in medieval Hindu Smriti texts with these texts cited as source, are missing from the currently surviving manuscripts.