According to Buddhist scriptures, the Bodhisattva Ksitigarbha was taught by Sakyamuni Buddha. Before Sakyamuni was destroyed and Maitreya was born, she vowed to do her best to save all suffering before becoming a Buddha. According to the Buddhist scriptures, the Tibetan bodhisattva was in the past.
He saved his mother who suffered in hell several times. Since he was robbed, he has always vowed to save all suffering beings, especially those in hell. Therefore, this Bodhisattva is considered to have the virtues of "great filial piety" and "great wish", so it is generally known as "the Bodhisattva who wishes the king to hide the earth".
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In addition, according to the book "The Wishing Sutra of the Earth-Tibet", the Earth-Tibet Bodhisattva has four origins:
(1) He used to be the son of an elder before robbery. Seeing Master Fenson's sincerity and solemn expression, he vowed never to rob others again and spare all beings for six sins, just to prove this point.
(2) It's incredible that a monk was robbed to be a Brahmin girl before. Because I want to save my mother from evil interests, I set a blessing. And vowed to do anything in the future, will suffer all kinds of crimes.
He used to be a king. Seeing that the people of China have done many evils, they vowed to save all suffering, and all beings came to Bodhi to become Buddhas themselves.
She was a woman when she was robbed. Because I want to save my dead mother who suffered in hell, I swear to help all suffering beings. When they became buddhas, they became enlightened.
Baidu Encyclopedia-Earth Treasure King Bodhisattva