Like a fish in a puddle, what joy is there

For years I've been trying to find the source of a quote, but I've only been able to get so far. The quote is "Like a fish in a puddle, what joy is there." This seems to come from some verses titled, "Samantabhadra's Admonition to the Assembly". My research indicates that it's part of the evening service for Pure Land schools of Buddhism. I've even found the Chinese for it. 是日已過， 命亦隨減， 如少水魚， 斯有何樂； 大眾當勤精進， 如救頭然， 但念無常， 慎勿放逸。 I can read and understand Japanese, but Chinese is only half a guess for me since I'm only using my understanding of Japanese to read it. But, I'm having a hard time finding Japanese sources. Most of my searches pull up Chinese sources. It seems it's from a sutra, but I don't which sutra it comes from. I have figured out that it's not from the Flower Garland Sutra (Avatamsaka Sutra), nor is it from the Lotus Sutra. Could anyone help me out?