觀無量壽佛經疏 2.95

2.95

言慈心不殺者，此明一切眾生皆以命為本。若見惡緣怖走藏避者，但為護命也。經云：「一切諸眾生無不愛壽命，勿殺勿行杖，恕己可為喻。」即為證也。

As for "with a compassionate mind not killing": this clarifies that all sentient beings take life as their foundation. If they see adverse conditions and flee in fear to hide, it is solely to protect their lives. A sūtra says: "All sentient beings / Do not fail to cherish life; / Do not kill and do not use the stick, / Forgiving others using oneself as the analogy." This serves as proof.