And as he is so scrupulous in his observance of the laws of knight-errantry, he will, no doubt, in order to keep his word, obey the injunction I have laid upon him.
…did not wish; and thereupon the unhappy gentleman began his sad story in nearly the same words and manner in which he had related it to Don Quixote and the goatherd a few days before, when, through Master Elisabad, and Don Quixote’s scrupulous observance of what was due to chivalry, the tale was left unfinished, as this history has already recorded; but now fortunately the mad fit kept off, allowed him to tell it to the end; and so, coming to the incident of the note which Don Fernando…
There are no more uses of "observance" in the book.
Show samples from other sources
As her release date neared, Vanessa got increasingly anxious, with a decided uptick in religious observance.
Piper Kerman -- Orange Is the New Black
"Religious observances shouldn’t be denied to anyone."