Sing unto the LORD, O ye saints of his, and give thanks at the remembrance of his holiness. Psalm 30:4.
King David wrote Psalm 30 at the dedication of his house, which is mentioned in 2 Samuel 5. He had already reigned in Hebron for over seven years before the elders of Israel came to him.
So all the elders of Israel came to the king to Hebron; and king David made a league with them in Hebron before the LORD: and they anointed David king over Israel. 2 Sam 5:3.
However, it was not until he captured Mount Zion from the Jebusites that he choose the stronghold of Zion for his house, and this stronghold came to be known as the city of David. Then Hiram, king of Tyre sent craftsman and materials to build David a house.
And David perceived that the LORD had established him king over Israel, and that he had exalted his kingdom for his people Israel’s sake. 2 Sam 5:12.
David now had more that just the acceptance of all Israel, but the recognition of the mighty king of Phoenicia.
Rejoice in the LORD, ye righteous; and give thanks at the remembrance of his holiness. Psalm 97:12.
We enjoy a direct experience of the holiness of the Lord by His everlasting remembrance of us. The Remembrance of the Lord is described in verses 10 and 11 of this Psalm.
You that love the LORD, hate evil: He preserves the souls of his saints; he delivers them out of the hand of the wicked. Light is sown for the righteous, and gladness for the upright in heart.
How do we know that we serve a Holy God? Because He is Faithful to His Word.
I will worship toward thy holy temple, and praise thy name for thy loving-kindness and for thy truth: for thou hast magnified thy word above all thy name. Psalm 138:2.