do-not-do-what-must-not-be

“When the said cavalcade had moved off a long way, Mullah first of all uttering his favorite saying: ‘So-and-so-and-so-must-be; DO-NOT-DO-WHAT-MUST-NOT-BE’, and having also uttered his favorite exclamation, somewhat resembling ‘Zrrt!!’, he returned to his place and suggested to me that I should do the same, then, having arranged the still smoldering charcoal on his ‘Kalyan’, he sighed deeply and pronounced the following tirade, which, as always, was not immediately understandable.BTG XXXIV