The interpretation timeline
1 Samuel 26:11 Douay-Rheims

The Lord be merciful unto me, that I extend not my hand upon the Lord’s anointed. But now take the spear, which is at his head, and the cup of water, and let us go.

A.D. 258 – 1871 5 witnesses

Patristic

before A.D. 750
258
A.D.
Cyprian Patristic
c. A.D. 200–258
“But what great and wonderful and Christian patience is to be found in David from whom Christ descended according to the flesh! David often had the opportunity to kill King Saul, his persecutor, who was eager to destroy him. Yet when Saul was subject to him and in his power, David preferred to save his life and did not retaliate on his enemy but, on the contrary, even avenged him when he was killed. In short, many prophets have been killed, many martyrs have been honored with glorious deaths, and all have attained their heavenly crowns through the merit of patience, for a crown for sorrow and suffering cannot be obtained unless patience in sorrow and suffering precede.”
Source
373
A.D.
c. A.D. 296–373
“For the truth is not preached with swords or with darts, nor by means of soldiers, but by persuasion and counsel. But what persuasion is there where fear of the emperor prevails? Or what counsel is there, when he who withstands them receives at last banishment and death? Even David, although he was a king and had his enemy in his power, did not prevent the soldiers by an exercise of authority when they wished to kill his enemy, but, as the Scripture says, David persuaded his men by arguments, and did not allow them to rise up and put Saul to death. But [the devil], being without arguments of reason, forces all men by his power, that it may be shown to all that their wisdom is not according to God but merely human, and that they who favor the Arian doctrines have indeed no king but Caesar; for by his means it is that these enemies of Christ accomplish whatsoever they wish to do.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“The Lord forbid that I should stretch forth mine hand against the Lord's anointed,.... Or suffer any about him to do it; he speaks of it with the utmost detestation and abhorrence: but, I pray thee, take thou now the spear that is at his bolster; not to smite him with, as he desired, but to carry off, and was no other than his sceptre; See Gill on Sa1 20:33, and the cruse of water; which stood in the same place, as appears by Sa1 26:12. Some take this to be a pot to make water in; others an hourglass, to know the time of night, in which not sand, but water, flowed for that purpose: but rather this was for his refreshment should he be hot and thirsty in the night, or to purify him from any nocturnal pollution that might happen; for, according to Clemens of Alexandria (m), it was a custom of the Jews often to purify themselves in bed: though Fortunatus Scacchus (n) thinks Saul had this pot or cup for a religious use; which he had with him, and with it gave thanks to God, the author of all good, whenever he sat down to a meal; such as the golden cup Philip king of Macedon always had under his pillow when he slept (o): and let us go; and do nothing more; which would be sufficient to convince they had been there, and to show what was in their power to do, had they been so inclined. (m) Stromat. l. 4. p. 531. (n) Elaeochrism. Myrothec. l. I. c. 44. col. 224. (o) Plin. Nat. Hist. l. 33. c. 3.”
Source
1871
A.D.
1871
“the spear that is at his bolster, and the cruse of water--The Oriental spear had, and still has, a spike at the lower extremity, intended for the purpose of sticking the spear into the ground when the warrior is at rest. This common custom of Arab sheiks was also the practice of the Hebrew chiefs. at his bolster--literally, "at his head"; perhaps, Saul as a sovereign had the distinguished luxury of a bolster carried for him. A "cruse of water" is usually, in warm climates, kept near a person's couch, as a drink in the night time is found very refreshing. Saul's cruse would probably be of superior materials, or more richly ornamented than common ones, and therefore by its size or form be easily distinguished.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.