Amitāyus Contemplation Sūtra
The Amitāyus Contemplation Sūtra (simplified Chinese: 佛说观无量寿佛经; traditional Chinese: 佛說觀無量壽佛經; pinyin: Fóshuōguānwúliàngshòufójīng, English: Contemplation of Amitāyus Sutra, or Sutra on the Visualization of Measureless Life [Buddha], Taisho no. 365) is a Mahāyāna sutra which is important for East Asian Pure Land Buddhism, a major branch of East Asian Mahāyāna.
Source: Wikipedia — Amitāyus Contemplation Sūtra (CC BY-SA 4.0)