8. Prayer (Kitab Al-Salat) Detailed Injunctions about Witr - كتاب الوتر

23) Chapter: Regarding Supplication (Ad-Du'a)

'Asma daughter of Yazid reported the Prophet (ﷺ) as saying: "Allah's Greatest Names is in these two verses: "And your Ilaah (God) is One Ilaah (God), none has the right to be worshipped but He, the Ever-Merciful, the Mercy-Giving' and the beginning of Surah Al 'Imran, "A.L.M Allah, there is no deity but He, the Living, the Eternal."

Reference: 1496
English reference: Book 8, Hadith 1491
In-book reference: Book 8, Hadith 81
Grade: Hasan (Al-Albani)
Read this hadith from Darussalam Collection