Psalm 59:17

O my strength, I will make music to praise you! God is my defense (high fortress), my merciful God!

Psalm 59:9-10

O my strength, I watch for you! God is my stronghold, my merciful God!

Psalm 18:1

([Psalm of David]) I love you, O Jehovah, my strength.

Psalm 46:1

([Sons of Korah]) God is our refuge and strength, a ready help in times of trouble.

Treasury of Scripture Knowledge

Summary

Unto thee, O my strength, will I sing: for God is my defence, and the God of my mercy.

Bible References

O my

Psalm 18:1
([Psalm of David]) I love you, O Jehovah, my strength.
Psalm 46:1
([Sons of Korah]) God is our refuge and strength, a ready help in times of trouble.

For

Psalm 59:9
O my strength, I watch for you! God is my stronghold, my merciful God!