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1 Samuel 15:20ESV·author unknown

And Saul said to Samuel, “I have obeyed the voice of the LORD. I have gone on the mission on which the LORD sent me. I have brought Agag the king of Amalek, and I have devoted the Amalekites to destruction.

Matthew Henry Presbyterian @wholebiblehenry

Saul is here called to account by Samuel concerning the execution of his commission against the Amalekites; and remarkable instances we are here furnished with of the strictness of the justice of God and the treachery and deceitfulness of the heart of man. We are here told, I. What passed between God and Samuel, in secret, upon this occasion, Sa1 15:10, Sa1 15:11. 1.

Commenting on 1 Samuel 15:10-23

John Gill Reformed Baptist @doctorgill

And Saul said to Samuel, yea, I have obeyed the voice of the Lord,.... Here Saul breaks in upon Samuel before he had declared all that the Lord had said unto him; for having expostulated with him for not obeying the voice of the Lord, he could not forbear interrupting him, but with the utmost assurance affirms he had obeyed the voice of the Lord...

Geneva Bible Notes Reformed @genevanotes

And Saul said unto Samuel, Yea, I have obeyed the voice of the LORD, and have gone the way which the LORD sent me, and have brought Agag the king of Amalek, and have utterly destroyed the Amalekites. (i) He stands most impudently in his own defence both against God and his own conscience.