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1 Samuel 15:31BSB·author unknown

So Samuel went back with Saul, and Saul worshiped the LORD.

Matthew Henry Presbyterian @wholebiblehenry

Saul is at length brought to put himself into the dress of the penitent; but it is too evident that he only acts the part of a penitent, and is not one indeed. Observe, I. How poorly he expressed his repentance. It was with much ado that he was made sensible of his fault, and not till he was threatened with being deposed. This touched him in a tender part.

Commenting on 1 Samuel 15:24-31

John Gill Reformed Baptist @doctorgill

So Samuel turned again after Saul,.... Though he before said he would not, Sa1 15:26 yet he did, changing his mind, as he might without being chargeable with a lie; and he also might have an impulse from the Lord so to do, and which he did not in order to worship with Saul, which it does not appear he did, but rather the contrary...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Samuel turned again after Saul--not to worship along with him; but first, that the people might have no ground, on pretense of Saul's rejection, to withdraw their allegiance from him; and secondly, to compensate for Saul's error, by executing God's judgment upon Agag.