Psalm 144:15
Happy is that people, that is in such a case: yea, happy is that people, whose God is the Lord.
Cross-references
Psalm 33:12 proclaims the same beatitude: 'Blessed is the nation whose God is the Lord' — directly echoing this declaration.
Psalm 146:5 calls blessed those who hope in the Lord — a direct parallel to the confession that blessedness comes from having God as Lord.
Deuteronomy 33:29 declares Israel blessed as a people saved by the Lord — the same beatitude of a people whose God is the Lord.
Jeremiah 31:1 declares the covenant 'I will be their God, they will be my people' — the same relationship that makes a people blessed in Psalm 144:15.
Jeremiah 32:38 repeats the covenant formula 'they will be my people, I will be their God' — the basis for the blessing in Psalm 144:15.
Zechariah 13:9 shows a remnant declaring 'The Lord is my God' — the same confession that makes a people blessed in Psalm 144:15.