Was it this? "I am Canadian, a free Canadian, free to speak without fear, free to worship God in my own way, free to stand for what I think right, free to oppose what I believe wrong, free to choose those who govern my country. This heritage of freedom I pledge to uphold for myself and all mankind.".
or maybe this? “I swear (or affirm) that I will be faithful and bear true allegiance to Her Majesty Queen Elizabeth the Second, Queen of Canada, Her Heirs and Successors, and that I will faithfully observe the laws of Canada, and fulfil my duties as a Canadian citizen.”
