Proverbs 11:25 - Matthew Poole's English Annotations on the Holy Bible

The liberal soul, Heb. the soul of blessing; that man who is a blessing to others, who blesseth them, i.e. doeth good to them, as blessing is oft used for a gift, as Genesis 33:11 1 Samuel 25:27 2 Corinthians 9:5. Shall be made fat; shall be greatly enriched, both with temporal and spiritual blessings. He that watereth shall be watered also himself possibly it is a metaphor from a fountain, which when it poureth forth its waters is instantly filled again, whereas if it be stopped it groweth empty, and the water seeketh another course. Others render it, he shall be a rain, i.e. he shall receive such liberal supplies from God, that he shall be able to pour forth showers of good things upon others.