Matthew Henry on 1 Samuel 20:24-34
Jonathan is here effectually convinced of that which he was so loth to believe, that his father had an implacable enmity to David, and would certainly be the death of him if it were in his power; and he had like to have paid very dearly himself for the conviction.
I. David is missed from the feast on the first day, but nothing is said of him. The king sat upon his seat, to feast upon the peace-offerings as at other times (Sa1 20:25), and yet had his heart as full of envy and malice against David as it could hold. He should first have been reconciled to him, and then have come and offered his gift; but, instead of that, he hoped, at this feast, to drink the blood of David. What an abomination…
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he is not clean--No notice was taken of David's absence, as he might be laboring under some ceremonial defilement.
Adam Clarke on 1 Samuel 20:25
The king sat upon his seat - It seems that there was one table for Saul, Jonathan, David, and Abner; Saul having the chief seat, that next to the wall. As only four sat at this table, the absence of any one would soon be noticed.
John Gill on 1 Samuel 20:26
Nevertheless, Saul spake not anything that day,.... About David's absence, took no notice of it, said nothing about it:
for he thought something had befallen him; some impurity, some nocturnal pollution, see Leviticus 15:16,
he is not clean, surely he is not clean; which he repeated in his mind for the confirmation of it, and in contempt, and to the reproach of David; and in this way he accounted for his absence the first day, and so was easy, it not being lawful and fitting for an unclean person in a ceremonial sense to eat of the peace offerings, which Saul and his family were now partaking of.
Keil & Delitzsch on 1 Samuel 20:24-34
David thereupon concealed himself in the field, whilst Jonathan, as agreed upon, endeavoured to apologize for his absence from the king's table.
Sa1 20:24-25
On the new moon's day Saul sat at table, and as always, at his seat by the wall, i.e., at the top, just as, in eastern lands at the present day, the place of honour is the seat in the corner (see Harmar Beobachtungen ii. pp. 66ff.). "And Jonathan rose up, and Abner seated himself by the side of Saul, and David's place remained empty." The difficult passage, "And Jonathan rose up," etc., can hardly be understood in any other way than as signifying that, when Abner entered, Jonathan rose from his seat by the side of Saul, and gave up the…