The expression "it is good" occurs five times in Psalms.

Ps 52:9 - Strength of the Lord, wait upon Him
Ps 54:9 - Sacrifice of the Lord, praise Him
Ps 73:28 - Sanctuary of the Lord, draw near unto Him
Ps 119:71 - Statutes of the Lord, learn them
Ps 147:1 - Singing unto our God, praise Him