Firstly, is glatt kosher a strict halachic requirement? It seems that some are satisfied with meat that is simply “kosher,” while other people uphold a requirement that their meat be “glatt kosher.” Is this a matter of different sects? Or simply minhag rather than halacha? Some communities somehow going “above and beyond” the strict letter of the law to demonstrate their devotion?
What is the scriptural origin and the scriptural context of the notion of meat being or having to be “glatt” kosher? Really what I’m wondering is what is the significance of adhesions to the lungs when other ethnicities don’t mind the integrity of pulmonary membranes and seem to get on fine. But I expect the answer to that simply to be “because it is a divine commandment.”
And so I am instead asking what is the origin and context of the idea to try to gain some insight from the context of where and when and how it was given.