Job 21:29

Have ye not asked them that go by the way? -Travelers, who have passed into other countries, and who have had an opportunity of making observations, and of learning the opinions of those residing there. The idea of Job is, that they might have learned from such travelers that such people were “reserved” for future destruction, and that calamity did not immediately overtake them. Information was obtained in ancient times by careful observation, and by traveling, and they who had gone into other countries would be highly regarded concerning point like this. They could speak of what they had observed of the actual dealings of God there, and of the sentiments of sages there.