God appeared to Abram and said, “I will give this land to your children.” Abram built an altar at the place God had appeared to him.
Genesis 12:7, The Message

What do we know about Sarai? She was Abram’s half sister (different mothers), and she was barren. Being unable to bear children was a real strike against her in her culture, which was the ultimate purpose for womanhood. Sarai must have been both exhilarated and anxious Abram told her about God’s promise.