Evan and kaisha

Or if anyone can at least answer if this is an example of passive se with a simple yes or no that would be good

I'm not sure if this is the right thread to ask this question if not please direct me and move this thread. No me refiero a todos ustedes; yo sé a quiénes he escogido. Pero esto es para que se cumpla la Escritura: “El que comparte el pan conmigo me ha puesto la zancadilla” What is the grammatical term or terms for this part of the sentence and is it the subject of the sentence or something else. "Pero esto es para que..." also I wasn't sure but is this se cumpla the passive se for the scripture being fulfilled with an unknown subject? If someone could translate it to English in the sense to clarify the parts of this sentence that would be great.