Genesis 16:10

“And the angel of the Lord said unto her, I will multiply thy seed exceedingly, that it shall not be numbered for multitude.”

KJV

Meaning

The messenger promises Hagar that her descendants will be multiplied so greatly that they will be too numerous to count.

This promise is addressed to Hagar herself, so her role in the chapter should not be reduced to serving the interests of Abram and Sarai.

God's attention to a vulnerable person's future challenges readers to recognize dignity and hope where social structures may see only utility.