The King of All Dharmas is the one word "Amitabha."
The five periods and the eight teachings are all contained within it.
One who single-mindedly remembers and recites his name
In samadhi will enter the Thus Come Ones' place of quiescence.
The King of All Dharmas is the one word "Amitabha."/ The five periods and the eight teachings are all contained within it. The teachings are arranged in eight categories, four according to the nature of the teaching: the storehouse teaching, the connecting teaching, the special teaching, and the perfect teaching; and four according to the methods of teaching: sudden, gradual, secret, and unfixed. The five periods are: The Avatamsaka, Agama, Vaipulya, Prajna, and Lotus-Nirvana. These eight teachings and five periods are all included in the one word "Amitabha."
One who single-mindedly remembers and recites his name / In samadhi will enter the Thus Come One's place of quiescence. Such a one will definitely go to the Pure Land of Eternal Stillness and Light, the Land of Ultimate Bliss. Living beings in the Dharma-ending Age will be saved by reciting the Buddha's name. And so whoever hopes to be saved should be mindful of the Buddha.
Speak one sentence less;
Recite the Buddha's name one time more.
Beat your thoughts to death,
And let your Dharma-body come alive.
Don't look lightly on the Dharma-door of reciting the Buddha's name.
Contemplate at All Times and Reflect Well .
Zen and tripitaka master Hsuan Hua
The Buddha taught
So, bhikkhus, you should train in this way: The heart-deliverance of loving-kindness will be maintained in being and made much of by us, used as our vehicle, used as our foundation, established, consolidated, and properly managed. That is how you should train
Samyutta Nikaya 20:3