The answer is: He wasn't told

Gen 12:2 / Heb 11:8

Abraham's journey is often highlighted as a monumental leap of faith. Genesis 12:1 recounts God’s command to leave the familiar comforts of his home and venture into the unknown. The astonishing part? God didn’t offer Abraham a detailed end destination! Instead, he was promised that he would inherit a great land, which is eventually revealed. This reflects a profound aspect of spiritual faith: stepping out without knowing where the path may lead often requires greater trust than traveling a well-marked road.

In Hebrews 11:8, Abraham's obedience becomes the template for faith that many strive for today. He not only acted but did so boldly, trading the security of his life in Ur for a promise of something greater. This isn’t just the story of one person but an echo traversing through ages—resonating in many faith narratives. Followers of different traditions interpret their calling to venture forth in similar ways, even when the plans aren’t crystal clear.

Interestingly, throughout scripture, journeys symbolize spiritual quests and the pursuit of truth. Just as Abraham ventured, countless others, like Moses and even Jesus’ disciples, stepped out with faith despite uncertainty. It’s a vital reminder that the act of believing is often more about the journey than the destination; it shapes our character and connects us with the divine in surprising and powerful ways. Abraham's legacy continues to teach that sometimes, faith isn't finding the road, but just bravely taking the first step.