This is a Mahāyāna Hṛdaya Sūtra text dedicated to the deity Amoghapāśa, a form of the Bodhisattva Avalokiteśvara. It explains the stories of Amoghapāśa and how he rescued people from difficult times and situations.
Amoghapāśa-nāma-hṛdaya-mahāyāna-sūtra' (Matsunami)
General Library, The University of Tokyo