The 99 Names · Names Most Often Paired in the Quran
Al-Mubeen المبين
The One who makes clear to His servants the path of guidance, explaining what they should do and what they should leave.
Explanation
A detailed explanation of this name (in Arabic) is in: Sharh Asma' Allah al-Husna fi Daw' al-Kitab wa al-Sunnah — Dr. Sa'eed ibn 'Ali ibn Wahf al-Qahtani — p. 200 ↗
Evidence
﴿يَوۡمَئِذࣲ يُوَفِّيهِمُ ٱللَّهُ دِينَهُمُ ٱلۡحَقَّ وَيَعۡلَمُونَ أَنَّ ٱللَّهَ هُوَ ٱلۡحَقُّ ٱلۡمُبِينُ ٢٥﴾
Call upon Allah by this name
“To Allah belong the Beautiful Names, so call upon Him by them” — Al-A'raf 180
Example for practice
اللهم يا مبين، بيّن لي الحق وارزقني اتباعه، وبيّن لي الباطل وارزقني اجتنابه
O Allah, O Al-Mubeen, show me the truth and grant me to follow it, and show me falsehood and grant me to avoid it.
An example for practice, not a transmitted text — following the Quranic way of closing a request with the fitting name (see Ibn al-Qayyim, Bada'i' al-Fawa'id 2/249).