Riyad us-Saliheen

Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "Whoever sits in a place where he does not remember Allah (SWT), he will suffer loss and incur displeasure of Allah; and whoever lies down (to sleep) in a place where he does not remember Allah, he will suffer sorrow and incur displeasure of Allah."

Jabir bin Samurah (May Allah be pleased with them) reported: Whenever we came to the gathering of the Prophet, we would sit down at the end (of the assembly)..

Ibn 'Umar (May Allah be pleased with them) reported: Messenger of Allah (ﷺ) seldom left a gathering without supplicating in these terms: "Allahumma-qsim lana min khashyatika ma tahulu bihi bainana wa baina ma'sika, wa min ta'atika ma tuballighuna bihi jannataka, wa minal-yaqini ma tuhawwinu 'alaina masa-'ibad-dunya. Allahumma matti'na biasma'ina, wa absarina, wa quwwatina ma ahyaitana, waj'alhul-waritha minna, waj'al tharana 'ala man zalamana, wansurna 'ala man 'adana, wa la taj'al musibatana fi dinina, wa la taj'alid-dunya akbara hammina, wa la mablagha 'ilmina, wa la tusallit 'alaina man-la yarhamuna, (O Allah, apportion to us such fear as should serve as a barrier between us and acts of disobedience; and such obedience as will take us to Your Jannah; and such as will make easy for us to bear in the calamities of this world. O Allah! let us enjoy our hearing, our sight and our power as long as You keep us alive and make our heirs from our own offspring, and make our revenge restricted to those who oppress us, and support us against those who are hostile to us let no misfortune afflict our Deen; let not worldly affairs be our principal concern, or the ultimate limit of our knowledge, and let not those rule over us who do not show mercy to us)."

Abu Hurairah (May Allah be pleased with him) reported: The Prophet (ﷺ) said, "Whenever a group of people sit in a gathering in which they do not remember Allah the Exalted, nor supplicate to elevate the rank of their Prophet, such a gathering will be a cause of grief to them. If Allah wills, He will punish them, and if He wills He will forgive them."