Ksitigarbha

If I do not go to hell to help, who will go? Only when all beings have been liberated, will I become Buddha ~ Kṣitigarbha

"If I do not go to hell to help them, who else will go?" is the famous declaration popularly attributed to Ksitigarbha. No matter what the crime or the karma, he is willing to have a connection with any being and to help free anyone from suffering.
 
fds uta irs  a fnduamentally a teaching concerning karmic retribution, graphically describing the consequences one creates for oneself by committing undesirable actions.

 This is especially for the benefit of future beings in the Dharma-Ending Age in order to help these beings avoid making the mistakes that will cause them to be reborn in a low condition. With the motivation to help suffering beings always in mind, the sutra is [structured as] a discourse given by the Buddha in praise of the Bodhisattva Ksitigarbha and his heroic vow, and of the benefits one can receive from honoring Ksitigarbha and reading the sutra.

Presented in the form of a seemingly mythic dialogue between the Buddha and Ksitigarbha, the teaching takes place in a certain heaven called Trayastrimsa ("The World of the Thirty-Three"), in front of a vast multitude of buddhas, bodhisattvas, devas, and spirits [i.e., pretas, asuras, nagas, yakshas]. Immediately prior to his departure from this world, the Buddha manifested in Trayastrimsa so that he might repay the kindness of his mother who dwelt there by speaking the Dharma on her behalf.

[This would mean that, if it happened, it would have happened in the few moments before reclining into into final nirvana, Earth time, when the Buddha briefly traversed the meditative absorptions called dhyanas/jhanas.

So from another aspect the sutra deals with filial responsibility -- not only between oneself and one's parents, but also in an ultimate sense of a universal code of duty or responsibility for all living beings, all of whom a bodhisattva regards with the same kindness, consideration, and respect one would accord to one's own parents. This, together with the practice of acts for the good of all, is the Bodhisattva's vision.