Lalitha Sahasranamam is a part of the Brahmanda Purana and It was given to the great Rishi Agastya by Lord Hayagriva, an incarnation of Lord Vishnu. 84 Shlokas in the Brahmanda Purana speaks about the benefits of reciting Lalitha Sahasranamam and it was Veda Vyasa who propagated and conveyed it to humanity.
Lalitha Sahasranamam is an encomium to the Goddess Lalitha Tripura Sundari, extolling her virtues, victories, associations, aspects, greatness, perfections, powers, and manifestations. Goddess Lalitha Tripura Sundari is one of the ten Mahavidyas. Tripura Sundari Devi is considered the highest manifestation of Adi Parashakti.
Sri Lalitha Sahasranamam Stotram
Regular chanting of Sri Lalitha Sahasranama will ward off the evil from uncompleted pooja vidhis or rituals etc. It will also form a way of penance.
Ithi shree brahmaanda puraane utthara khande shree hayagrevaagasthya samvaade shree lalithaa rahasyanaama saahasra sthothra kadhanam dvithiyo adhyaah
Thus ends the most secretive Lalitha Sahasranamam, the prayer of Lalitha containing her thousand names, from the second chapter of the Brahmanda Purana in the dialogue between Hayagriva and Agasthya