'Begotten' in the Bible

For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son?

So also Christ glorified not himself to be made an high priest; but he that said unto him, Thou art my Son, to day have I begotten thee.

By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son,