Moses
Genesis 24:15ESV·traditional attribution

Before he had finished speaking, behold, Rebekah, who was born to Bethuel the son of Milcah, the wife of Nahor, Abraham’s brother, came out with her water jar on her shoulder.

John Calvin Reformed @genevareformer

15. Before he had done speaking. The sequel sufficiently demonstrates that his wish had not been foolishly conceived. For the quickness of the answer manifests the extraordinary indulgence of God, who does not suffer the man to be long harassed with anxiety.

Matthew Henry Presbyterian @wholebiblehenry

Abraham's servant now begins to make a figure in this story; and, though he is not named, yet much is here recorded to his honour, and for an example to all servants, who shall be honoured if, by faithfully serving God and their masters, they adorn the doctrine of Christ (compare Pro 27:18 with Tit 2:10); for there is no respect of persons with God, Col 3:24, Col 3:25.

Commenting on Genesis 24:10-28

John Gill Reformed Baptist @doctorgill

And it came to pass, before he had done speaking,.... In his heart, Gen 24:45; for his prayer was mental; while the last words were dropping from him, that very moment, as the Targum of Jonathan; so soon were his prayers heard and answered, Isa 65:24, that behold Rebekah came out; out of Haran, the city of Nahor: who was born to Bethuel, son of...