Unknown Author
1 Samuel 18:9ESV·author unknown

And Saul eyed David from that day on.

Matthew Henry Presbyterian @wholebiblehenry

Now begin David's troubles, and they not only tread on the heels of his triumphs, but take rise from them, such is the vanity of that in this world which seems greatest. I. He was too much magnified by the common people. Some time after the victory Saul went a triumphant progress through the cities of Israel that lay next him, to receive the congratulations of the country.

Commenting on 1 Samuel 18:6-11

John Gill Reformed Baptist @doctorgill

And Saul eyed David from that day and forward. Instead of looking pleasantly, and with a smile, upon him, as a courtier and favourite, he was justly entitled to by his gallant behaviour, he looked at him with a sour, ill natured look; he looked at him with an evil, spiteful, malicious, and envious eye; or he diligently watched and observed all his motions and...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Saul eyed David--that is, invidiously, with secret and malignant hatred.