As a complement to this question on Shortened Birkat Hamazon, I would like to better understand the practice I saw of stopping Birkat Hamazon after the fourth blessing on Shabbat and not saying the Harachamans and the closing text.
I believe it comes from the idea one should not make specific asks on Shabbat although others are saying that asks as part of an organized prayer are all right.
- Where is this custom coming from?
- How widepread is it?
- Are there communities where it is the norm and rabbanim supporting it?