قَالَ النَّبِيُّ ﷺ:يَقُولُ اللَّهُ تَعَالَى: أَنَا عِنْدَ ظَنِّ عَبْدِي بِي، وَأَنَا مَعَهُ إِذَا ذَكَرَنِي، فَإِنْ ذَكَرَنِي فِي نَفْسِهِ ذَكَرْتُهُ فِي نَفْسِي، وَإِنْ ذَكَرَنِي فِي مَلَأٍ ذَكَرْتُهُ فِي مَلَأٍ خَيْرٍ مِنْهُمْ

Qāla an-Nabiyyu ﷺ: Yaqūlu Allāhu Taʿālā: Anā ʿinda ẓanni ʿabdī bī, wa-anā maʿahu idhā dhakaranī, fa-in dhakaranī fī nafsihī dhakartuhu fī nafsī, wa-in dhakaranī fī mala’in dhakartuhu fī mala’in khayrin minhum

The Prophet of Allah () said: “Allah, the Exalted, says: I am as My slave thinks I am, and I am with him when he remembers Me. If he remembers me alone, I remember him in Myself, and if he remembers Me in a gathering, I remember him in a gathering better than it

(Agreed upon by Al-Bukhari and Muslim  – Narrated by Abu Hurayrah)