'Myself' in the Bible

Then David sent messengers to Ish-Bosheth the son of Saul, saying, "Give [me] my wife Michal whom I betrothed to myself for a hundred foreskins of [the] Philistines."

I will demean myself again more than this, and I will be abased in my eyes, but with the maids whom you mentioned, with them I will be honored."

Absalom commanded his servants, saying, "Please watch. At the moment the heart of Amnon [is] {tipsy} with wine, then I shall say to you, 'Strike Amnon down,' and you shall kill him! Don't be afraid. [Is] it not I myself who has commanded you? Be courageous and be {valiant!}

Then the king said to the woman, "Go to your house, and I myself will give the command concerning you."

I was blameless before him, and I kept myself from my iniquity.