Genesis 17:20 - Blessed without Knowing.

And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.

I have heard thee refers to Abraham's intercessory prayer for his thirteen year old son, Ishmael. However, even before Ishmael was born, God had already blessed his seed to multiply exceedingly that it shall not be numbered for multitude (Genesis 16: 10).