The Fellowship of the Ring
"For I have become very fond of Strider. Well, fond is not the right word. I mean he is dear to me; though he is strange, and grim at times. In fact, he reminds me often of you. I didn't know that any of the Big People were like that. I thought, well, that they were just big, and rather stupid: kind and stupid like Butterbur; or stupid and wicked like Bill Ferny. But then we don't know much about Men in the Shire, except perhaps the Breelanders." (2.1.25)
Many Elves and many mighty Men, and many of their friends, had perished in the war. Anárion was slain, and Isildur was slain; and Gil-galad and Elendil were no more. Never again shall there be any such league of Elves and Men; for Men multiply and the Firstborn decrease, and the two kindreds are estranged. And ever since that day the race of Númenor has decayed, and the span of their years has lessened. (2.2.39)
"It was not the fault of the Dwarves that the friendship waned," said Gimli.
"I have not heard it was the fault of the Elves," said Legolas.
"I have heard both," said Gandalf; "and I will not give judgement now. But I beg you two, Legolas and Gimli, at least to be friends, and to help me. I need you both. The doors are shut and hidden, and the sooner we find them the better. Night is at hand." (2.4.76-8)