Moses
Genesis 16:7ESV·traditional attribution

The angel of the LORD found her by a spring of water in the wilderness, the spring on the way to Shur.

John Calvin Reformed @genevareformer

7. And the angel of the Lord found her . We are here taught with what clemency the Lord acts towards his own people, although they have deserved severe punishment. As he had previously mitigated the punishment of Abram and Sarai, so now he casts a paternal look upon Hagar, so that his favor is extended to the whole family.

Matthew Henry Presbyterian @wholebiblehenry

Here is the first mention we have in scripture of an angel's appearance. Hagar was a type of the law, which was given by the disposition of angels; but the world to come is not put in subjection to them, Heb 2:5. Observe, I. How the angel arrested her in her flight, Heb 2:7.

Commenting on Genesis 16:7-9

John Gill Reformed Baptist @doctorgill

And the angel of the Lord found her,.... This is the first time that mention is made of an angel in Scripture, but is not to be understood of a created angel, but of a divine Person, as appears from Gen 16:10, the uncreated angel, the Logos or Son of God, called the Angel of God's presence, and the Angel of the covenant, Isa 63:9...