Ruling on Phrases: "In my pledge," "In my father's head," and "By al-'Awn"

The questioner:
He says: Honorable Shaykh, may Allah grant you success, there are phrases that are widespread, and I hope you will clarify their ruling, may Allah preserve you. The first phrase is "In my pledge."

The Shaykh:
So, it is not permissible because it resembles swearing an oath by other than Allah. Even though "in" is not one of the letters of oath, it is similar to an oath, so one should avoid this.

The questioner:
And "In my father's head."

The Shaykh:
It is the same, it is the same, but replace the letter of oath with "in," yes.

The questioner:
“By the aid.”

The Shaykh:
As for "al-'Awn," it is not permissible to swear by other than Allah. If "al-'Awn" is like what we hear, that it is an idol, then it is explicitly shirk (associating partners with Allah). And if it is not an idol, it is not permissible to swear by "al-'Awn," and we do not know what it is. It is not permissible to swear by anything unknown. We swear by Allah, Mighty and Majestic.