觀無量壽佛經疏 3.71

3.71

十、從除無量下，至生彼國已來，正明依法觀察除障多劫，身器清淨應佛本心，捨身他世必往無疑。

Tenth, from "Eliminates immeasurable" down to "be born in that land," it directly explains that contemplating according to the Dharma eliminates obstacles for many kalpas; the vessel of one's body is purified, corresponding to the Buddha's original intention, and upon relinquishing the body in another life one will certainly go there without doubt.