'O God' in the Bible

They were helped against them, and the Hagrites and all who were with them were given into their hand; for they cried out to God in the battle, and He answered their prayers because they trusted in Him.

Then say, “Save us, O God of our salvation,And gather us and deliver us from the nations,To give thanks to Your holy name,And glory in Your praise.”

This was a small thing in Your eyes, O God; but You have spoken of Your servant’s house for a great while to come, and have regarded me according to the standard of a man of high degree, O Lord God.

David said to God, “I have sinned greatly, in that I have done this thing. But now, please take away the iniquity of Your servant, for I have done very foolishly.”

David said to God, “Is it not I who commanded to count the people? Indeed, I am the one who has sinned and done very wickedly, but these sheep, what have they done? O Lord my God, please let Your hand be against me and my father’s household, but not against Your people that they should be plagued.”