The Ruling on Swearing by Allah in Supplication and Its Form

Question:
Honorable Shaykh, may Allah preserve you, what is the ruling on swearing by Allah the Exalted in supplication, what is its formulation, and is it a form of faith with Allah?

Answer:
Swearing by Allah that He will do good to His servants is good, because it is part of having a good opinion of Allah (Mighty and Majestic). Among Allah’s servants are those whom, if they swear by Allah, He will fulfill their oath. So, if swearing by Allah is that He will do good to His servants, such as helping them against their enemy in battle or relieving them with rain when they are in drought, this is good, because it is a good opinion of Allah (Mighty and Majestic). However, if swearing by Allah is that He will not do good, such as saying, “By Allah, He will not forgive so-and-so,” or a man saying, “By Allah, Allah will not forgive so-and-so,” this is not permissible; because it is bad manners with Allah (Glorified and Exalted is He), bad manners and a bad opinion of Allah (Mighty and Majestic). And this nullifies the deed, as in the hadith of the man who said, “By Allah, Allah will not forgive so-and-so,” so Allah (Exalted and Majestic is He) said: Therefore, it is not permissible to swear by Allah that He will not do good to His servants, because this is restricting Allah (Glorified and Exalted is He), bad manners with Allah, and a bad opinion of Allah, so this is not permissible. Yes.