WE RELATE WITH ṣaḥīḥ isnāds from the books of at-Tirmidhī, an-Nasā’ī, Ibn Mājah and others, from ‘Ā’ishah 
who narrated: “I asked: ‘Messenger of Allah, if I know it is the Night of the Decree, what should I say?’ He answered: ‘Say: O Allah, You are Forgiving and You love forgiveness, so forgive me.’” [1].According to at-Tirmidhī, this hadith is ḥasan ṣaḥīḥ.
who narrated: “I asked: ‘Messenger of Allah, if I know it is the Night of the Decree, what should I say?’ He answered: ‘Say: O Allah, You are Forgiving and You love forgiveness, so forgive me.’” [1].According to at-Tirmidhī, this hadith is ḥasan ṣaḥīḥ.
Allāhumma innaka ‘Afuwwun tuḥibbu-l-‘afwa fa-‘fu ‘annī.
Our [Shāfi‘ī] colleagues have said that it is mustaḥabb to supplicate in abundance during this night. Recitation of the Qur’ān, and all the adhkār and du‘ās that are mustaḥabb on other noble occasions, are also mustaḥabb; and we have previously explained them together and individually. According to ash-Shāfi‘ī, “One should exert oneself [in doing this] as strenuously during the day as during the night,” and that was what he said. It is mustaḥabb to make du‘ā’ for the needs and the important concerns of the Muslims, for that is the character of the righteous and the perceptive servants of Allah. And it is Allah Who grants success.
References
[1] At-Tirmidhī (3508), Ibn Mājah (3850), and al-Ḥākim in al-Mustadrak (1/530), who grades it as ṣaḥīḥ ; and adh-Dhahabī agrees.