'From the Lord' in the Bible

Now concerning virgins, although I do not have any command from the Lord, I will give you my opinion as one who by the Lord's mercy is trustworthy.

If I am not an apostle to other people, surely I am one to you, for you are the evidence of my apostolic authority from the Lord.

For I received from the Lord what I also passed on to you how the Lord Jesus, on the night he was betrayed, took a loaf of bread,