Knowing that he was a just man and an Holy - A holy, pious, upright, honest man - a man who would not be afraid of him, or afraid to speak his real sentiments.

And observed him - Margin, "kept him, or saved him." This does not mean that he "observed" or obeyed his teachings, but that he kept him in safe custody in order to preserve him from the machinations of Herodias. He was willing to show his respect for John, and to secure him from danger, and even to do "many things" which might indicate respect for him - at least, to do so much as to guard him from his enemies.

And did many things - But he did not do the thing which was demanded of him - to break off from his sins. He attempted to make a compromise with his conscience. He still loved his sins, and did "other" things which he supposed might be accepted in the place of putting away, as he ought, the wife of his brother - the polluted and adulterous woman with whom he lived. Perhaps he treated John kindly, or spoke well of him, or aided him in his wants, and attempted in this way to silence his rebukes and destroy his faithfulness. This was probably before John was imprisoned. So sinners often treat ministers kindly, and do much to make them comfortable, and hear them gladly, while they are still unwilling to do the thing which is demanded of them - to repent and believe the gospel. They expect that their kind attentions will be accepted in the place of what God demands - repentance and the forsaking of their sins.

yet for his oath's sake—See how men of no principle, but troublesome conscience, will stick at breaking a rash oath, while yielding to the commission of the worst crimes!

and for their sakes which sat with him—under the influence of that false shame, which could not brook being thought to be troubled with religious or moral scruples. To how many has this proved a fatal snare!

he would not reject her.

yet for his oath's sake, and for their sakes which sat with him; as Matthew adds, "at meat", Matthew 14:9; for it seems as if supper was not over, when all this was transacting.

He would not reject her; deny her her request, or send her away without granting it which could not be without grieving her, and treating her with contempt, and defrauding her of the promise; all which ideas are expressed by some versions.