Psalms 31:21

“Blessed [be] the Lord, etc.] A form of thanksgiving, in which the psalmist calls upon himself and others to bless and praise the Lord for the singular mercy granted him, expressed in the next clause; (see Gill on “<191846>Psalm 18:46”); for he hath showed me his marvellous kindness in a strong city; either in the city Keilah, so Jarchi; a city which had gates and bars, where Saul thought he had David safe, and he could not escape his hands; but notwithstanding that, and though the inhabitants of that place intended to deliver him up, yet he was marvellously saved; as he also was from the Ziphites; and when Saul and his army had encompassed him about, by a surprising incident, a messenger…”

“Blessed be the Lord - An expression of thanksgiving for the evidence that God had heard him in his troubles, and had answered him. For he hath showed me his marvelous kindness - literally, “He has made his mercy wonderful;” that is, he has showed me such mercy as to be an object of admiration and astonishment. It was not ordinary kindness, such as is shown to people every day; it was so uncommon - so far beyond all expectation - so separate from second causes and the agency of man - so marked in its character - as to fill the mind with wonder. In a strong city - Margin, “fenced city.” This may mean either that he had thus placed him literally in a strongly fortified city where he was safe…”

“City - In Keilah: where God wonderfully preserved me. Psalms 31:22”

“31:21-22 Praise the Lord: The psalmist expresses his joy at the experience of God’s goodness and love. Throughout his ordeal, the Lord has cared for him.”

“marvellous: Psa 17:7, Psa 98:1, Psa 118:23; Pe1 2:9 strong city: or, fenced city, Sa1 23:7-13; Jer 1:18 Psalms 31:22”