Albert Barnes' Notes on the Whole Bible - 1 Samuel 21:9
Wrapped in a cloth behind the ephod - Rather, “in the cloak,” Goliath’s military cloak, which was part of the dedicated trophy. The ephod was naturally hung up where the high priest alone could get at it. read more
The Pulpit Commentary - 1 Samuel 21:10-15
Uncertain light. The facts are— 1 . In continued fear of Saul, David flees to the king of Gath. 2 . Being recognised as the conqueror of Goliath, he fears the consequences. 3 . To escape vengeance he feigns madness. 4 . Achish the king thereupon refuses to have him in his service. There is no evidence that David received any Divine direction through the high priest, but the reverse ( 1 Samuel 22:15 ). He appears to have been left to the exercise of his own judgment as to... read more