觀無量壽佛經疏 4.117

4.117

二、從下品下生者，正明辨定其位，即是具造五逆等重罪凡夫人也。

Second, the passage from "those born in the lowest rank of the lower grade" directly clarifies and defines their status, which refers to ordinary beings who have fully committed grave offenses such as the five deadly sins.