Mahayana account (Avalokiteśvara)

According to Mahayana doctrine, Avalokiteśvara is the bodhisattva who has made a great vow to listen to the prayers of all [[sentient beings]] in times of difficulty, and to postpone his own Buddhahood until he has assisted every being on earth in achieving nirvana. Mahayana sutras associated with Avalokiteśvara include the Heart Sutra and the Lotus Sutra, particularly the 25th chapter which is sometimes referred to as the Avalokiteśvara Sutra.

Source

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