ABU DHABI, United Arab Emirates — Pope Francis used the keynote address of his roughly 40-hour stay in the United Arab Emirates to breach delicate taboos on Monday, specifically mentioning Yemen, where his hosts are engaged in a brutal war, and calling on countries throughout the Gulf region to extend citizenship rights to religious minorities.

The remarks by Francis were exceptionally candid for a pope who as a general rule does not criticize the country that hosts him and avoids drawing undue attention to the issues that its rulers would rather not discuss. Rather, he often weighs in diplomatically before landing in the country, or waits until he crosses the border to the next.

But on Monday, during the first visit by a pope to the Arabian Peninsula, where Islam was born, Francis was blunt in a speech before hundreds of leaders from a broad array of faiths on a day used to underscore the need for humanity to stop committing violence in the name of religion.

“Human fraternity requires of us, as representatives of the world’s religions, the duty to reject every nuance of approval from the word ‘war,’” Francis said at the towering Founder’s Memorial in Abu Dhabi.