Two rites are brought together here which belong especially to the Feast of Tabernacles and the Day of Atonement, respectively, namely, drawing and pouring out water, and fasting. Hence, some think that Samuel chose the Feast of tabernacles, and the fast which preceded it, as the occasion for assembling the people. Others explain the pouring out water as the pouring out the heart in penitence as it were water; or, as a symbolic act expressing their ruin and helplessness 2 Samuel 14:14; or as typifying their desire that their sins might be forgotten “as waters that pass away” Job 11:16.
And Samuel judged - This seems to denote the “commencement” of Samuel’s Judgeship civil and military, as having taken place at Mizpeh on this occasion. As civil Judge he did exactly what Moses did Exodus 18:13-16; as military Judge he did what Othniel, Ehud, Barak, and Gideon had done before him, organized and marshalled the people for effectual resistance to their oppressors, and led them out to victory.