What is the ruling on swearing by saying, "By the Prophet, you will do such and such"?

The questioner:
He says: Honorable Shaykh, may Allah grant you success. Some people, when they want something from another person, say to him, "By the Prophet, you will do such and such." Is there anything wrong with this statement? And...

The Shaykh:
This is an oath. This is an oath by other than Allah and the Prophet. This is an oath by other than Allah. However, he may have grown up with this and did not intend to swear; it simply became habitual on his tongue. But in any case, this phrase must be avoided, and whoever does this must be forbidden from it. It is often on the tongues of Egyptians: "By the Prophet, such and such."

The questioner:
And he says, may Allah preserve him.

The Shaykh:
He says, "By the Prophet, I am a monotheist." Yes.

The questioner:
And he says, may Allah keep you safe. Did he refute the one who mentions this matter?

The Shaykh:
Yes, explain it to him, teach him. Perhaps he is ignorant and does not know. Explain to him this. He saw people in his country saying it and grew up with it. I think it is permissible.