Matthew Henry Presbyterian @wholebiblehenry

Here, I. David, in distress, flies in the tabernacle of God, now pitched at Nob, supposed to be a city in the tribe of Benjamin. Since Shiloh was forsaken, the tabernacle was often removed, though the ark still remained at Kirjath-jearim. Hither David came in his flight from Saul's fury (Sa1 21:1), and applied to Ahimelech the priest. Samuel the prophet could not protect him, Jonathan the prince could not.

Commenting on 1 Samuel 21:1-9

John Gill Reformed Baptist @doctorgill

Now a certain man of the servants of Saul was there that day,.... When David came to Nob, and asked bread of the priest, and had it, which this man was an eyewitness of, Sa1 22:9, detained before the Lord; either because it was sabbath day, and so he might not travel, at least no more than two thousand cubits; or by some vow of...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Doeg, an Edomite--who had embraced the Hebrew religion. detained before the Lord--at the tabernacle, perhaps, in the performance of a vow, or from its being the Sabbath, which rendered it unlawful for him to prosecute his journey. the chiefest of the herdmen that belonged to Saul--Eastern monarchs anciently had large possessions in flocks and herds; and the office of the chief shepherd was an important one.