I’m sure almost everyone knows the song (or the idea mentioned in it) Daddy Dear, which says that Hashem has a cup that collects all the tears we cry. When it’s full, Mashiach will come.
Is there a source for this? Is it brought down in a Midrash? Or was it something invented that just sounds nice, but has no real basis?
Dont know about moshiach coming when the cup is full. Thats a new one on me. But the concept of Hashem keeping our tears comes from tehillim 56:9 and is mentioned in selichos of “Hashem Hashem”.