'O God' in the Bible

So God was good to the midwives, and the people [of Israel] multiplied and became very strong.

Now it happened after a long time [about forty years] that the king of Egypt died. And the children of Israel (Jacob) groaned and sighed because of the bondage, and they cried out. And their cry for help because of their bondage ascended to God.

But Moses said to God, “Who am I, that I should go to Pharaoh, and that I should bring the children of Israel out of Egypt?”

Then Moses said to God, “Behold, when I come to the Israelites and say to them, ‘The God of your fathers (ancestors) has sent me to you,’ and they say to me, ‘What is His name?’ What shall I say to them?”

Then Jethro, Moses’ father-in-law, took a burnt offering and [other] sacrifices [to offer] to God, and Aaron came with all the elders of Israel to eat a meal with Moses’ father-in-law before God.

Moses went up to God [on the mountain], and the Lord called to him from the mountain, saying, “Say this to the house of Jacob and tell the Israelites:

“Remember the Sabbath (seventh) day to keep it holy (set apart, dedicated to God).

then his master shall bring him to God [that is, to the judges who act in God’s name], then he shall bring him to the door or doorpost. And his master shall pierce his ear with an awl (strong needle); and he shall serve him for life.

You shall consecrate them, that they may be most holy; whatever touches them must be holy (set apart for God).

Then Moses said [to the Levites], “Dedicate yourselves today to the Lord—for each man has been against his own son and his own brother [in his attempt to escape execution]—so that He may restore and bestow His blessing on you this day.”