'Please' in the Bible

Then David said to God, "I have sinned severely [in] that I have done this thing. But now, please forgive the sin of your servant, for I have been very foolish."

Then David said to God, "Was it not I [who] gave a command to count the people? Now I [am] he who has sinned, and I have certainly done wickedness, but these sheep, what have they done? O Yahweh, my God, please let your hand be against me and against the house of my father, but against your people, [let there be] no plague."

Then David said to Ornan, "Please give me the place, the threshing floor, that I might build an altar on it to Yahweh; at full price please give it to me, that the plague against the people might be stopped."