Something hath befallen; some accident which hath rendered him unclean, and so unfit to partake of this feast, which consisted in part of the remainders of these peace-offerings, according to the law, Leviticus 7:20; unfit also to come into any company, much more into the king's company, lest he should pollute them also. See Poole on "1 Samuel 20:5". See also Le 11 Le 15.
Related Commentaries of 1 Samuel 20:26
1 Samuel 20:26
26 Nevertheless Saul spake not any thing that day: for he thought, Something hath befallen him, he is not clean; surely he is not clean.