觀無量壽佛經義疏 2.85

2.85

「『若觀是地者，除八十億劫生死之罪。』」八十億劫，或云無量劫、或云五萬、或云五十億劫，隨宜不定，非凡所測。二、除疑。

"‘If one contemplates this ground, one eliminates the transgressions of birth and death of eighty hundred million kalpas.’" "Eighty hundred million kalpas" is elsewhere called immeasurable kalpas, or fifty thousand, or five billion kalpas; it varies according to what is fitting and is not something ordinary beings can fathom. Second, eliminating doubt.